We are using for audio and video calls Jitsi Meet.
When I’m in a call in Teams, Channels or Direct Messages, I want to see who I’m connected to. Since I am a member of many teams and channels and there are also many direct messages, it is easy to lose track.
Hi! Welcome to our forums 
The thing here is that Jitsi integration is loosely attached to Rocket.Chat, meaning that it’s an iframe or a new window to a jitsi session.
Each user will join without any prior relation to Rocket.Chat at that moment, and register themselves.
So this information (usernames and users on a jitsi call) will only reside in Jitsi.
Did I get your question right?
Thanks!