On Android 17 (on Pixel) you can select the password service under Settings -> Passwords and passkeys -> Preferred service.
If you have an alternative password manager installed, it will be listed there along with Google's own password manager. iOS has a similar setting but I don't know exactly where off the top of my head.
I have this set to my password manager but I still can't _use_ the pass-keys in my password manager to sign in to most apps.
Setting your preferred password/passkey manager on Android 17 to 1Password works fine in Chrome and Firefox to log in to any site, presenting passkeys managed in 1Password. It also works in all of Meta's native apps. (I'm pretty sure it works the same in Bitwarden.)
Whatever issue you're having, it's not an inherent limitation of Android passkeys. It might be a bug in your passkey manager…?
So yeah, this is cross platform on iOS, macOS, Windows, and Linux.