diff --git a/android/filegroup.go b/android/filegroup.go
index a8326d4..ff0f74e 100644
--- a/android/filegroup.go
+++ b/android/filegroup.go
@@ -19,6 +19,7 @@
 	"strings"
 
 	"github.com/google/blueprint"
+	"github.com/google/blueprint/proptools"
 )
 
 func init() {
@@ -36,9 +37,9 @@
 
 type fileGroupProperties struct {
 	// srcs lists files that will be included in this filegroup
-	Srcs []string `android:"path"`
+	Srcs proptools.Configurable[[]string] `android:"path"`
 
-	Exclude_srcs []string `android:"path"`
+	Exclude_srcs proptools.Configurable[[]string] `android:"path"`
 
 	// The base path to the files.  May be used by other modules to determine which portion
 	// of the path to use.  For example, when a filegroup is used as data in a cc_test rule,
@@ -89,7 +90,7 @@
 }
 
 func (fg *fileGroup) GenerateAndroidBuildActions(ctx ModuleContext) {
-	fg.srcs = PathsForModuleSrcExcludes(ctx, fg.properties.Srcs, fg.properties.Exclude_srcs)
+	fg.srcs = PathsForModuleSrcExcludes(ctx, fg.properties.Srcs.GetOrDefault(ctx, nil), fg.properties.Exclude_srcs.GetOrDefault(ctx, nil))
 	if fg.properties.Path != nil {
 		fg.srcs = PathsWithModuleSrcSubDir(ctx, fg.srcs, String(fg.properties.Path))
 	}
diff --git a/etc/prebuilt_etc.go b/etc/prebuilt_etc.go
index e168edc..fd3b27f 100644
--- a/etc/prebuilt_etc.go
+++ b/etc/prebuilt_etc.go
@@ -74,11 +74,11 @@
 type prebuiltEtcProperties struct {
 	// Source file of this prebuilt. Can reference a genrule type module with the ":module" syntax.
 	// Mutually exclusive with srcs.
-	Src *string `android:"path,arch_variant"`
+	Src proptools.Configurable[string] `android:"path,arch_variant,replace_instead_of_append"`
 
 	// Source files of this prebuilt. Can reference a genrule type module with the ":module" syntax.
 	// Mutually exclusive with src. When used, filename_from_src is set to true.
-	Srcs []string `android:"path,arch_variant"`
+	Srcs proptools.Configurable[[]string] `android:"path,arch_variant"`
 
 	// Optional name for the installed file. If unspecified, name of the module is used as the file
 	// name. Only available when using a single source (src).
@@ -158,6 +158,8 @@
 	installDirPath         android.InstallPath
 	additionalDependencies *android.Paths
 
+	usedSrcsProperty bool
+
 	makeClass string
 }
 
@@ -247,10 +249,10 @@
 }
 
 func (p *PrebuiltEtc) SourceFilePath(ctx android.ModuleContext) android.Path {
-	if len(p.properties.Srcs) > 0 {
+	if len(p.properties.Srcs.GetOrDefault(ctx, nil)) > 0 {
 		panic(fmt.Errorf("SourceFilePath not available on multi-source prebuilt %q", p.Name()))
 	}
-	return android.PathForModuleSrc(ctx, proptools.String(p.properties.Src))
+	return android.PathForModuleSrc(ctx, p.properties.Src.GetOrDefault(ctx, ""))
 }
 
 func (p *PrebuiltEtc) InstallDirPath() android.InstallPath {
@@ -264,7 +266,7 @@
 }
 
 func (p *PrebuiltEtc) OutputFile() android.OutputPath {
-	if len(p.properties.Srcs) > 0 {
+	if p.usedSrcsProperty {
 		panic(fmt.Errorf("OutputFile not available on multi-source prebuilt %q", p.Name()))
 	}
 	return p.outputFilePaths[0]
@@ -319,7 +321,9 @@
 func (p *PrebuiltEtc) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	var installs []installProperties
 
-	if p.properties.Src != nil && len(p.properties.Srcs) > 0 {
+	srcProperty := p.properties.Src.Get(ctx)
+	srcsProperty := p.properties.Srcs.GetOrDefault(ctx, nil)
+	if srcProperty.IsPresent() && len(srcsProperty) > 0 {
 		ctx.PropertyErrorf("src", "src is set. Cannot set srcs")
 	}
 
@@ -331,8 +335,8 @@
 
 	filename := proptools.String(p.properties.Filename)
 	filenameFromSrc := proptools.Bool(p.properties.Filename_from_src)
-	if p.properties.Src != nil {
-		p.sourceFilePaths = android.PathsForModuleSrc(ctx, []string{proptools.String(p.properties.Src)})
+	if srcProperty.IsPresent() {
+		p.sourceFilePaths = android.PathsForModuleSrc(ctx, []string{srcProperty.Get()})
 		// If the source was not found, set a fake source path to
 		// support AllowMissingDependencies executions.
 		if len(p.sourceFilePaths) == 0 {
@@ -367,7 +371,8 @@
 			symlinks:       p.properties.Symlinks,
 		}
 		installs = append(installs, ip)
-	} else if len(p.properties.Srcs) > 0 {
+	} else if len(srcsProperty) > 0 {
+		p.usedSrcsProperty = true
 		if filename != "" {
 			ctx.PropertyErrorf("filename", "filename cannot be set when using srcs")
 		}
@@ -377,7 +382,7 @@
 		if p.properties.Filename_from_src != nil {
 			ctx.PropertyErrorf("filename_from_src", "filename_from_src is implicitly set to true when using srcs")
 		}
-		p.sourceFilePaths = android.PathsForModuleSrc(ctx, p.properties.Srcs)
+		p.sourceFilePaths = android.PathsForModuleSrc(ctx, srcsProperty)
 		for _, src := range p.sourceFilePaths {
 			filename := src.Base()
 			output := android.PathForModuleOut(ctx, filename).OutputPath
diff --git a/rust/compiler.go b/rust/compiler.go
index efc3dee..a2546a1 100644
--- a/rust/compiler.go
+++ b/rust/compiler.go
@@ -197,7 +197,7 @@
 	Features []string `android:"arch_variant"`
 
 	// list of configuration options to enable for this crate. To enable features, use the "features" property.
-	Cfgs []string `android:"arch_variant"`
+	Cfgs proptools.Configurable[[]string] `android:"arch_variant"`
 
 	// specific rust edition that should be used if the default version is not desired
 	Edition *string `android:"arch_variant"`
@@ -338,7 +338,7 @@
 }
 
 func cfgsToFlags(cfgs []string) []string {
-	flags := []string{}
+	flags := make([]string, 0, len(cfgs))
 	for _, cfg := range cfgs {
 		flags = append(flags, "--cfg '"+cfg+"'")
 	}
@@ -385,8 +385,9 @@
 func (compiler *baseCompiler) cfgFlags(ctx ModuleContext, flags Flags) Flags {
 	flags = CommonDefaultCfgFlags(flags, ctx.RustModule().InVendor(), ctx.RustModule().InProduct())
 
-	flags.RustFlags = append(flags.RustFlags, cfgsToFlags(compiler.Properties.Cfgs)...)
-	flags.RustdocFlags = append(flags.RustdocFlags, cfgsToFlags(compiler.Properties.Cfgs)...)
+	cfgFlags := cfgsToFlags(compiler.Properties.Cfgs.GetOrDefault(ctx, nil))
+	flags.RustFlags = append(flags.RustFlags, cfgFlags...)
+	flags.RustdocFlags = append(flags.RustdocFlags, cfgFlags...)
 
 	return flags
 }
diff --git a/rust/library.go b/rust/library.go
index 1eb0c5e..2a21263 100644
--- a/rust/library.go
+++ b/rust/library.go
@@ -504,15 +504,19 @@
 	flags = library.baseCompiler.cfgFlags(ctx, flags)
 	flags = CommonLibraryCfgFlags(ctx, flags)
 
+	cfgs := library.baseCompiler.Properties.Cfgs.GetOrDefault(ctx, nil)
+
 	if library.dylib() {
 		// We need to add a dependency on std in order to link crates as dylibs.
 		// The hack to add this dependency is guarded by the following cfg so
 		// that we don't force a dependency when it isn't needed.
-		library.baseCompiler.Properties.Cfgs = append(library.baseCompiler.Properties.Cfgs, "android_dylib")
+		cfgs = append(cfgs, "android_dylib")
 	}
 
-	flags.RustFlags = append(flags.RustFlags, cfgsToFlags(library.baseCompiler.Properties.Cfgs)...)
-	flags.RustdocFlags = append(flags.RustdocFlags, cfgsToFlags(library.baseCompiler.Properties.Cfgs)...)
+	cfgFlags := cfgsToFlags(cfgs)
+
+	flags.RustFlags = append(flags.RustFlags, cfgFlags...)
+	flags.RustdocFlags = append(flags.RustdocFlags, cfgFlags...)
 
 	return flags
 }