Support Big Blue Button as a Videoconference Service.
(https://bigbluebutton.org/)
Unfortunately BigBlueButton do not offer a user facing API. Rather their API calls are made server to server so it is not possible to implement this in eM Client.
Too bad 
ok, try try to setup Nextcloud Talk. I hope it works on my own server.
But BBB offers a general API, so if the room name would be configurable in emClient the general API could be used in a similar way like the Nextcloud application does it.
I have the same problem, using BBB usually everywhere. For every Video conference I need to add the room link manually.