diff --git a/.changeset/lemon-eyes-grin.md b/.changeset/lemon-eyes-grin.md
index 890a143c47..7cbd4b29f1 100644
--- a/.changeset/lemon-eyes-grin.md
+++ b/.changeset/lemon-eyes-grin.md
@@ -2,4 +2,4 @@
 '@backstage/create-app': patch
 ---
 
-Switched `next-app` template to use blueprint from `@backstage/plugin-app-react.
+Switched `next-app` template to use blueprint from `@backstage/plugin-app-react`.
diff --git a/.changeset/tired-sides-share.md b/.changeset/tired-sides-share.md
new file mode 100644
index 0000000000..661a7aee50
--- /dev/null
+++ b/.changeset/tired-sides-share.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-app-react': patch
+---
+
+Internal refactor to move implementation of blueprints from `@backstage/frontend-plugin-api` to this package.
diff --git a/packages/frontend-defaults/src/createApp.test.tsx b/packages/frontend-defaults/src/createApp.test.tsx
index 47f6b7895d..3a9ea91bec 100644
--- a/packages/frontend-defaults/src/createApp.test.tsx
+++ b/packages/frontend-defaults/src/createApp.test.tsx
@@ -60,8 +60,8 @@ describe('createApp', () => {
         }),
       },
       features: [
-        createFrontendPlugin({
-          pluginId: 'test',
+        createFrontendModule({
+          pluginId: 'app',
           extensions: [
             ThemeBlueprint.make({
               name: 'derp',
diff --git a/packages/frontend-plugin-api/src/blueprints/ApiBlueprint.test.ts b/packages/frontend-plugin-api/src/blueprints/ApiBlueprint.test.ts
index 6d16a215e1..8043752687 100644
--- a/packages/frontend-plugin-api/src/blueprints/ApiBlueprint.test.ts
+++ b/packages/frontend-plugin-api/src/blueprints/ApiBlueprint.test.ts
@@ -200,6 +200,7 @@ describe('ApiBlueprint', () => {
           "test": {
             "$$type": "@backstage/ExtensionInput",
             "config": {
+              "internal": false,
               "optional": false,
               "singleton": false,
             },
diff --git a/packages/frontend-plugin-api/src/wiring/createExtensionInput.ts b/packages/frontend-plugin-api/src/wiring/createExtensionInput.ts
index b4fe9983b9..760bd4b984 100644
--- a/packages/frontend-plugin-api/src/wiring/createExtensionInput.ts
+++ b/packages/frontend-plugin-api/src/wiring/createExtensionInput.ts
@@ -60,11 +60,11 @@ export interface ExtensionInput<
  * plugin. The following options are available:
  *
  * - `singleton`: If set to `true`, only one extension can be attached to the
- *   input at a time. Additional extension will trigger an app error and be
+ *   input at a time. Additional extensions will trigger an app error and be
  *   ignored.
  * - `optional`: If set to `true`, the input is optional and can be omitted,
  *   this only has an effect if the `singleton` is set to `true`.
- * - `internal`: If set to `true`, only extensions from the same plugins will be
+ * - `internal`: If set to `true`, only extensions from the same plugin will be
  *   allowed to attach to this input. Other extensions will trigger an app error
  *   and be ignored.
  *
diff --git a/plugins/app-react/src/blueprints/AppRootWrapperBlueprint.test.tsx b/plugins/app-react/src/blueprints/AppRootWrapperBlueprint.test.tsx
index cd459b371f..a61f583ca8 100644
--- a/plugins/app-react/src/blueprints/AppRootWrapperBlueprint.test.tsx
+++ b/plugins/app-react/src/blueprints/AppRootWrapperBlueprint.test.tsx
@@ -20,6 +20,7 @@ import {
   coreExtensionData,
   createExtension,
   createExtensionInput,
+  createFrontendModule,
 } from '@backstage/frontend-plugin-api';
 import { renderTestApp } from '@backstage/frontend-test-utils';
 
@@ -63,7 +64,11 @@ describe('AppRootWrapperBlueprint', () => {
       },
     });
 
-    renderTestApp({ extensions: [extension] });
+    renderTestApp({
+      features: [
+        createFrontendModule({ pluginId: 'app', extensions: [extension] }),
+      ],
+    });
 
     await waitFor(() => expect(screen.getByText('Hello')).toBeInTheDocument());
   });
@@ -95,20 +100,28 @@ describe('AppRootWrapperBlueprint', () => {
     });
 
     renderTestApp({
-      extensions: [
-        extension,
-        createExtension({
-          name: 'test-child',
-          attachTo: { id: 'app-root-wrapper:test', input: 'children' },
-          output: [coreExtensionData.reactElement],
-          factory: () => [coreExtensionData.reactElement(<div>Its Me</div>)],
+      extensions: [],
+      features: [
+        createFrontendModule({
+          pluginId: 'app',
+          extensions: [
+            extension,
+            createExtension({
+              name: 'test-child',
+              attachTo: extension.inputs.children,
+              output: [coreExtensionData.reactElement],
+              factory: () => [
+                coreExtensionData.reactElement(<div>Its Me</div>),
+              ],
+            }),
+          ],
         }),
       ],
       config: {
         app: {
           extensions: [
             {
-              'app-root-wrapper:test': { config: { name: 'Robin' } },
+              'app-root-wrapper:app': { config: { name: 'Robin' } },
             },
           ],
         },