Sharing other screen time apps that are much better than the OS based ones on all the platform:
Stay Free - I think it’s a privacy nightmare, but they do free cross platform in depth tracking on every platform. Apps are clunky (best I can describe), but there’s a wealth of data. Best I’ve found so far.
Activity Watch - Still very much in Beta, but works on nearly every platform, but I don’t believe the cross platform syncing works yet.
Mindful - Open source. Only an android.