diff --git a/src/Uno.Sdk/Sdk/Sdk.props.buildschema.json b/src/Uno.Sdk/Sdk/Sdk.props.buildschema.json
index 06d275a561b2..2c0393949adb 100644
--- a/src/Uno.Sdk/Sdk/Sdk.props.buildschema.json
+++ b/src/Uno.Sdk/Sdk/Sdk.props.buildschema.json
@@ -305,6 +305,10 @@
 					"description": "Adds the Uno.Extensions.Core.WinUI package.",
 					"helpUrl": "https://aka.platform.uno/feature-extensions-core"
 				},
+				"ThemeService": {
+					"description": "Adds the Uno.Extensions.Core.WinUI package.",
+					"helpUrl": "https://aka.platform.uno/feature-extensions-core"
+				},
 				"Hosting": {
 					"description": "Adds support for Dependency Injection using Uno.Extensions.Hosting packages.",
 					"helpUrl": "https://aka.platform.uno/feature-hosting"
diff --git a/src/Uno.Sdk/Tasks/ImplicitPackagesResolver.cs b/src/Uno.Sdk/Tasks/ImplicitPackagesResolver.cs
index c2658555177a..49907a373d18 100644
--- a/src/Uno.Sdk/Tasks/ImplicitPackagesResolver.cs
+++ b/src/Uno.Sdk/Tasks/ImplicitPackagesResolver.cs
@@ -168,7 +168,7 @@ public void AddUnoExtensionsPackages()
 			AddPackage("Uno.Extensions.Configuration", UnoExtensionsVersion);
 		}
 
-		if (useExtensions || HasFeature(UnoFeature.ExtensionsCore))
+		if (useExtensions || HasFeature(UnoFeature.ExtensionsCore) || HasFeature(UnoFeature.ThemeService))
 		{
 			AddPackage("Uno.Extensions.Core.WinUI", UnoExtensionsVersion);
 		}
diff --git a/src/Uno.Sdk/UnoFeature.cs b/src/Uno.Sdk/UnoFeature.cs
index 7ceebc56757a..c6a317b3b935 100644
--- a/src/Uno.Sdk/UnoFeature.cs
+++ b/src/Uno.Sdk/UnoFeature.cs
@@ -34,6 +34,9 @@ public enum UnoFeature
 	[UnoArea(UnoArea.Extensions)]
 	ExtensionsCore,
 
+	[UnoArea(UnoArea.Extensions)]
+	ThemeService,
+
 	[UnoArea(UnoArea.Extensions)]
 	Hosting,
 
diff --git a/src/Uno.Sdk/targets/Uno.Extensions.Implicit.Packages.ProjectSystem.targets b/src/Uno.Sdk/targets/Uno.Extensions.Implicit.Packages.ProjectSystem.targets
index db1ba3914303..9082b31a4806 100644
--- a/src/Uno.Sdk/targets/Uno.Extensions.Implicit.Packages.ProjectSystem.targets
+++ b/src/Uno.Sdk/targets/Uno.Extensions.Implicit.Packages.ProjectSystem.targets
@@ -36,7 +36,7 @@
 		<_UnoProjectSystemPackageReference Include="Uno.Extensions.Configuration" ProjectSystem="true" />
 	</ItemGroup>
 
-	<ItemGroup Condition="$(_UseUnoExtensions) OR $(UnoFeatures.Contains(';ExtensionsCore;'))">
+	<ItemGroup Condition="$(_UseUnoExtensions) OR $(UnoFeatures.Contains(';ExtensionsCore;')) OR $(UnoFeatures.Contains(';ThemeService;'))">
 		<_UnoProjectSystemPackageReference Include="Uno.Extensions.Core.WinUI" ProjectSystem="true" />
 	</ItemGroup>