I have a Garmin Swim 2 and use the Garmin Connect app for Android. I also use the web dashboard but have not found any sleep score there.
Garmin Connect accurately shows my general sleep data, but there is no sleep score anywhere. This was a really fun score to see when I had my Fitbit, and I would compare with my partner all the time.
I see so many references to a "sleep score" available from Garmin Connect however in reality it is nowhere to be found. I'd love for this to come back, or I'll just dig up my old Fitbit from the closet for sleeping.
Garmin, pleeeease fix this!! Such a small detail that must be dead-easy to implement!