How to identify users by something other than key in the UI

I'm using the user's ID as my key when initializing the SDK. Is there a way to add users to a group or whitelist by something other than this key? For example, I want to search for the user's email in the UI and have it add their user ID to the whitelist.

It's hard to look at a whitelist of random IDs and say "oh I'm in this whitelist" without showing some associated metadata like email, name, etc.I tried adding attributes but these don't seem to appear anywhere in the UI