I tried this one: https://www.amazon.com/gp/product/B06X3ZZ3TX
It sucks, I don't recommend it. It doesn't latch onto the watch properly, so it often stops charging in the middle, and the charging itself is pretty slow, needed about 1.5-2 hours to charge compared to 15-20 minutes on the stock charger.
I ended up buying another stock one.