diff --git a/src/Umbraco.Web.UI.Client/libs/extensions-registry/interfaces/section-sidebar-app-extension-element.interface.ts b/src/Umbraco.Web.UI.Client/libs/extensions-registry/interfaces/section-sidebar-app-extension-element.interface.ts
new file mode 100644
index 0000000000..ebb2c7adea
--- /dev/null
+++ b/src/Umbraco.Web.UI.Client/libs/extensions-registry/interfaces/section-sidebar-app-extension-element.interface.ts
@@ -0,0 +1,5 @@
+import type { ManifestSectionSidebarApp } from '../models';
+
+export interface UmbSectionSidebarAppExtensionElement extends HTMLElement {
+	manifest?: ManifestSectionSidebarApp;
+}
diff --git a/src/Umbraco.Web.UI.Client/libs/extensions-registry/models/section-sidebar-app.model.ts b/src/Umbraco.Web.UI.Client/libs/extensions-registry/models/section-sidebar-app.model.ts
index a5fc3bb801..04e842a843 100644
--- a/src/Umbraco.Web.UI.Client/libs/extensions-registry/models/section-sidebar-app.model.ts
+++ b/src/Umbraco.Web.UI.Client/libs/extensions-registry/models/section-sidebar-app.model.ts
@@ -1,6 +1,7 @@
+import type { UmbSectionSidebarAppExtensionElement } from '../interfaces/section-sidebar-app-extension-element.interface';
 import type { ManifestElement } from '.';
 
-export interface ManifestSectionSidebarApp extends ManifestElement {
+export interface ManifestSectionSidebarApp extends ManifestElement<UmbSectionSidebarAppExtensionElement> {
 	type: 'sectionSidebarApp';
 	conditions: ConditionsSectionSidebarApp;
 }