ACuriousFellow Do you see your passwords in vanadium when you click: _settings > Password manager _. Mine is still blank .
Pretty sure that those are passwords that are saved only in Vanadium's built-in password manager. If you have saved some passwords there, those can be exported from Vanadium as a CSV file and, I assume, imported into Google Password Manager.
If you in Vanadium visit one of the sites you have saved passwords for in Google Password Manager, does it prompt you to autofill the login info?
Regarding passkeys, if you have used passkeys on a different Android device in the past, with the same Google account, you have a limited time to enable it for your current GrapheneOS profile. By going to a website that you have previously saved a passkey for, Google Password Manager will prompt you for your fingerprint/PIN, then ask you to enter the PIN that you had set on one of your previous devices.
That latter PIN is stored in secure elements on Google servers, and will be cleared after some weeks (can't recall the exact number). Hopefully, your GrapheneOS device unlock credential will then be stored in those secure elements as well, meaning that you might be able to use it to enable passkeys again if you sign out of the Google account or factory reset the device.