It would be useful if it were possible to store a TOTP code to a contact entry in Proton Mail, similar to what is supported in Proton Pass. The code would be shared with the contact. As an identity-verification feature, the contact and myself could use the time-generated code to verify by voice that the interlocutor is indeed the contact. This can be done today using Proton Authenticate but it would be useful to associate the TOTP code with a contact in the same manner this can be done for a userid in Proton Pass.