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.
- for remote communities, you can fetch which local users are subbed to it
- 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.