I use this with a lenovo WatchX and it works well. It is pretty basic so you can join the party and hack if you feel it. WatchX is very cheap. ~USD $30 on aliexpress.

I would not ever go near the lenovo watch android app which I consider to be on par with radioactive toxic waste.

Using gadgetbridge & Watch X is superior to the Apple Watch & ecosystem at about 1/10th the cost. Recommended.