I've seen posts that an Android WearOS version is complete and ready to be launched, but I don't think it is out yet.
However, I've been using this app on my Samsung watch since March:
Time, score, card keeping for Rugby Referees
play.google.com
Honestly, I can't find a fault in it. It was buggy earlier this year, but after providing feedback to the developer, I've since tested several builds and provided input, and I think it now offers 99% of what you want/need.
It keeps track of clocks, scores, penalties, including player number for each event, handles extra time, several defaults formats (10 a side, beach, etc) and custom for kids game, for example. At the end of the game it saves a match report on the watch and syncs it to your phone. You can also setup your match info on the phone (easier with bigger screen) and then sync it with the watch app.