A few weeks a go discord on linux had an update that enabled you to do screensharing on wayland even with audio.
There are a few bugs. For example, you can not change the window and sometimes have to reactivate the audio check box to have the audio work. Sadly the flatpak could not shit that update, because the chromium version shipped has to major bugs in flatpaks (issue).
But the stable .deb has now working screen sharing with audio. That is something that x11 does not have.
It’s been a thing for a while with rolling distros, let’s hope the release based ones ship it and their the flatpak issues so most users can enjoy sharing the screen with friends soon.