I want to add more People on Call Currently its p2p

I am using WEBRTC with Firebase. I want to add more People RemoteStream Screens.
I am using exactly this github code

This is my Firebase https://miro.medium.com/max/1400/1*bc-C_-tox0dF36v2p74rkA.png

Essentially you go through the same process as if you were starting another call while the existing call is in place, add the streams to the existing call with all participants but as you are talking peer to peer… that can get very connection heavy/bandwidth hungry due to each person sending and receiving extra streams for each new participant.

Best to look at integrating something like this.