Hey! I haven't done anything official or anything, but check out this reddit thread and the linked zip file.
https://www.reddit.com/r/godot/comments/efuazd/i_made_a_small_game_with_the_new_...
That's basically the networking part of Screenhead Arena, just cleaned up a little. If there is interest I might also put this on itch as a slightly more official thing with a proper explanation?