credential Subject
@SerialName(value = "credentialSubject" )
OID4VCI: ISO mDL: N/A. W3C Verifiable Credentials: OPTIONAL.
A JSON object containing a list of key value pairs, where the key identifies the claim offered in the Credential. The value MAY be a dictionary, which allows to represent the full (potentially deeply nested) structure of the verifiable credential to be issued. The value is a JSON object detailing the specifics about the support for the claim.