What the actual flying fuck, the apple password thing supports TOTP! That's great! (And a sad testament to how poorly the discoverability is on some ios features)
Not just that, they will detect QR code images to work around sites which assume that TOTP is only available by scanning your desktop screen from your phone.
Step Two[1] also does this, which is one of the reasons I've been using it for TOTP for the past few years. Nice to see that the built-in TOTP support can do that now too.