I have the same issue.
This happens when I test using a debug APK, pretty sure this will happen in my final APK. (60 FPS with jank)
Sadly some people here cannot even see the jank so they've been developing games and posting on google playstore.
I've tested some of their games and the jank is there (not to be rude). I've tested on 5+ devices already (J7, A30, A71 and few others)
Also some of us are new and want to develop without much coding and now having to report most of the things ourselves is a bit hard.
It took me too long to read and understand about chromium and android web view and the jankiness, instead of developing my own game.
At the end, I just hope there's someone with spare time to actually develop/test and do the reporting following the dev's response...
(I'm already working full time, so I'm out) 🫠