Auto expiration (deletion) of folders

My Problem

I am the admin of a rather large Nextcloud instance where we use group folders. It has gone a little out of hand and there are many group folders that aren't used anymore and should be deleted. But no one feels responsible for these folders anymore thus it is an organizational nightmare to contact everyone regarding their group folders and delete them by hand.

Proposed Solution

I am proposing a feature, that would allow setting an expiration date for a group folder after which it is deleted. There should be two distinct settings for this.
A) After the set time the group folder is deleted.
B) The set time is calculated from the last modification to the group folder. That would mean that as long as a groupfolder is actively used, it never expires. But when no one is using it anymore, the time ticks down and the folder is deleted.

Alternatives Considered

Setting a policy on the admin side that would allow me to delete groupfolders after a set time or a set time of inactivity. But this again would mean more work for me for a task that could be automated.

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The issue names no files, tests, or entry points. Start by locating the group-folder implementation and its administration settings, then determine how expiration and inactivity are represented; done means supporting both proposed expiration modes and deleting eligible group folders safely.