PF1 using JSON+JWTs

I was looking at the implementation guide and it says that JSON+JWTs can
support ZKPs. I interpret this to mean that it can support attribute based
credentials where I can sign attributes individually. As far as I know,
there's no registered algorithms in JOSE registries that support ZKPs.
Additionally, when I looked into this as well, I couldn't figure out a way
to do this because the payload and headers have to be concatenated and
base64url encoded, meaning you can't individually sign attributes. If I'm
overlooking something though I'd appreciate being corrected. Even better if
someone has an implementation of this working available, I'd love to learn
from it.

Thanks,
Kyle

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