Note: I have a Flow using the Admin Connectors set up that writes all apps and details (creator, ID) to the SharePoint list. In the background, the Support Form is stored in a SharePoint list. At the moment this doesn't support sending attachments. The eMail app users opens a pop-up where you can select users to email - this could be useful to communicate version updates / changes. The App Detail screen provides further details, a breakdown of the compliance status, the ability to submit the support form, an overview of users/roles of the app and the ability to email all users and re-publish the app. The front page shows all apps that a user has, and an indicator of compliance status which is based on if the app has been published in the last 60 days, if the app description is filled out and if the support form has been completed. The support form is what IT would typically require as a Support Procedure Manual for new apps. The app will show users their apps, and allow them to check compliance status and submit a support form.

I have been working on an app using the App Maker connector that would bring governance and support documentation closer to the app creator.

Portable app creator