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I just found out that the @ietf recently published JSContact yet another specification for storing contact data.
It’s super interesting, though, and I am falling down the rabbit hole of all the links and related information about this. 
One of the authors is Mario Loffredo, “First Technologist” of the Informatics and Telematics section of the Italian National Counsel for Research (CNR). 
It’s the first time I find an Italian in public sector research authoring a spec!
I just sent him a Linkedin connection request, even if I don’t even know why…
IETF DatatrackerRFC 9553: JSContact: A JSON Representation of Contact DataThis specification defines a data model and JavaScript Object Notation (JSON) representation of contact card information that can be used for data storage and exchange in address book or directory applications. It aims to be an alternative to the vCard data format and to be unambiguous, extendable, and simple to process. In contrast to the JSON-based jCard format, it is not a direct mapping from the vCard data model and expands semantics where appropriate. Two additional specifications define new vCard elements and how to convert between JSContact and vCard.