An error occurred while saving the commentWarren commented
So since sharing your screen/app with system sounds tends to cause echo for all the other parties I had an idea. I remote to another computer and use that to join the meeting in mute mode and then share my music app (say spotify or my NAS audio station) with system sounds. Remotely from this I can play music to the meeting. Then join the meeting properly as a user with my local PC and headset.
It's not simple but it works.