That's not how passkeys work, or look like they are going to work. They are secured by your existing device security.
This is why is it incredibly important to be vigilant and ensure no one learns what your device passcode is.
These are the steps to logging into an account using a passkey as per Google instructions:
- Go to the application.
- Click Sign in.
- Select their passkey.
- Use the device screen unlock to complete the login
Fast, secure sign-in using fingerprint-, face- or device-lock based on industry standards
developers.google.com