There’s FIDO CXF/CXP: https://fidoalliance.org/specs/cx/cxf-v1.0-ps-errata-2026030...
To my understanding both Apple Passwords and the Android equivalent allow you to export passkeys to a different app (password manager), but I haven’t tried it yet.
If anyone has direct experience I appreciate to know how it was.
I can confirm it works on iOS 27. I haven’t tried elsewhere though
I had a click around Apple Passwords on macos and I could not find a way to move my passkeys to another app. I could only see a way to share them with other Apple Passwords users.