Sub object

[rohe]

I think sub_meta, sub_is_leaf and jwks who all are about the subject named in the entity statement should be grouped into an object.
Obviously we can't use the key 'sub' since that is already in use, we have to find another name.
Something like this:

"subject_info": {
    "metadata": {},
    "is_leaf": "true",
    "jwks": {}
}