If you're an admin of an instance which it seems you are, you can fetch some info of limited usefulness depending on where the community and users are.

1. for remote communities, you can fetch which local users are subbed to it
2. for local communities, you can fetch all users subbed to it

There's no UI or API (that I know of), but it can be fetched from the db.

SELECT p.actor_id, cf.published 
FROM community_follower cf 
JOIN person p ON p.id = cf.person_id 
JOIN community c ON c.id = cf.community_id 
WHERE c.actor_id = 'https://lemm.ee/c/lemmydev';

A lemm.ee admin would get all users since the community is on their instance.
A sh.itjust.works admin would get sh.itjust.works users, etc.

Obviously, if your instance has neither the community nor the users, that's all moot.