Tell us the features you need, we will tell you if it's doable.
Webrtc outside of the sdk is a virtual black box, or as we like to call it Multiplayer.
You can connect to peers via a connecting server. The initial player acts as a host.
Connection to other non Construct apps via Multiplayer is not a regular thing.
There are other methods Like Websockets, or third parties, Photon, Firebase, etc.