How to list all circles in nexctcloud.

Hi!
I run a managed NextCloud instance for an association. Users can create circles (via Collaboratives) to share information and work together on files. I’d like to be able to know all the circles that exist in my instance to see if there’s any need to clean things up.
Is it possible for an administrator to list all circles (or all collaboratives)?
I have no idea how to do this!