Does this work in iOS?
https://apps.apple.com/us/app/keepass-touch/id966759076
A version (port/adaption) of syncthing for ios is out there too.
https://forum.syncthing.net/t/syncthing-for-ios/16045
I don't use iDevices so I don't know how well the above apps work.
Works great.
So it’ll work, but not conveniently.