I often want to put sensitive data into a login that's not a password. Most commonly, this is 2FA recovery codes. I don't want them visible at first glance, so I end up using a "password" field, but it bugs me because this also shows a password strength rating and offers a password generator, neither of which I want. What I'd really like is a "secure" field that doesn't show the contents by default, just like password fields, but doesn't have any of the other password affordances.
Alternatively, instead of a "secure" field, I would also be happy with the ability to attach a "secure note" to a login. For the recovery code case that would be simpler as I could put all the codes in a single note instead of having one field per recovery code. Though there are other scenarios where I would want it to be organized like any other field instead of a trailing note. So in an ideal world, both would be supported.
Of course, this applies to all platforms too, not just Mac, but I don't see a forum board for "feature requests that apply to the product as a whole".
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