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. Iā€™d like to be able to know all the circles that exist in my instance to see if thereā€™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!