Request: Including Third-Party App Editor Pages in Site Hierarchy

Feature Request|We are collecting votes for this issue
Currently, when defining your site hierarchy it is not possible to set a parent-child page relationship with an Editor page that is part of a third-party app.
You can define your hierarchy by setting parent-child page relationships between pages that are not part of third-party apps.
We are always working to update and improve our products, and your feedback is greatly appreciated.