Some Systems use Key Based Logins, or Master Code Backups instead of Traditional/Conventional Username/Email, and Password Fields.

Some examples would be Nostr, Mullvad, and KycNotMe

It would be helpful to have a field that allows you to select a Key login instead of username, and password, or text.

Allow an option to replace Username / Password with Keys.

Systems like these are not to be confused with 2FA TOTP passwords.