Is this in Passwords or the Notes app?

I tried Notes app with the Lock but it requires another password while I want it all under the FaceID/iCloud password like the settings-passwords

Is there a secure note option in passwords - mine all require username web url and password.

You might have to check your settings. Previously there was a separate password for Notes, but now there is an option to keep it tied to your account's password

it is the Keychain Access app

Oh that’s only on MacOs not iOS, right?

I am pretty sure it is limited to the desktop OS.