Integrate Jitsi to web app

Greetings,

I came from https://jitsi.github.io/handbook/docs/dev-guide/dev-guide-iframe and start messing around a bit with it using react js.

First I would like to know what’s the user limit on group meetings,
Second if there is a way to get active meetings and group them by a custom field or something similar.
Also if you can get the users inside those meetings a counter is okay too.