Upstate1618 The first post in this thread describes how to save a FIDO private key in a password manager, instead of on a hardware key. "Passkeys" is just a term that users are familiar with. I could rename the topic to "FIDO private keys as MFA in a password manager on GrapheneOS", but who's going to care.
If you are stuck and unable to continue with the guide, please specify what the issue is. If you want to make an argument for always using the term "passkey" in the FIDO Alliance's definition of the term as password-less authentication, please just start a new topic.