I think it's only available on stock OSes, it's one of those things we tech nerds sacrifice for freedom.
But for the kind of person who uses a period app connected to the internet, yeah that's not a problem lmao.
fwiw there are apps to make migrating easier on custom OSes as well, a quick search shows at least BARIA on f-droid.
i mean looking at how all animals behave, in the absence of anything resembling their natural habitat they'd probably hear a fan running and feel it's close enough to running water.