Need to Fetch Group Members using Custom Application with AppOnly Access

I have a folder that is shared with a Group and a few users. I'm trying to fetch users of the corresponding group. I'm using Box Java SDK v2.58.0 and the Application that I've created is a Custom Server Authentication App with "AppOnly" access.

Can someone please assist me here as to how can I fetch all the users of a particular group that has access to a particular folder?

Any help would be highly appreciated.