Have you looked at the on-line form? You fill it out as the USC/account owner. Your spouse is not required to file as a NRA, and it does not ask for an ITIN/SSN for the 'joint owner'.
It's a bit different from prior years. You list your details including SSN as the 'principal joint owner' for joint accounts, and only yourself as the owner of any account in your name only. If your spouse has accounts that have no signature authority or joint interest, those accounts are not listed.