There’s Zenitizer by an indie dev
https://apps.apple.com/us/app/meditation-timer-zenitizer/id6...
https://apps.apple.com/us/app/meditation-timer-zenitizer/id6...
It started as a typical "scratch my own itch" indie project since I, too, was looking for an app like this for iOS and watchOS and couldn't find one that ticked the boxes for me.
Happy to answer questions and always open for feedback!
Cheers!