Phil ArcherAIUI, the folks behind JSON schema have resisted the idea of it becoming a formal standard anywhere. I'm not in the community so I don't know whether that's fully true or what the background might be, even so, it does seem that the first steps along the path to an RFC have been taken https://datatracker.ietf.org/doc/html/draft-dusseault-json-schema
JSON Schema
JSON Schema defines the media type "application/schema+json", a JSON- based format for describing the structure of JSON data. JSON Schema asserts what a JSON document must look like, ways to extract information from it, and how to interact with it. The "application/ schema-instance+json" media type provides additional feature-rich integration with "application/schema+json" beyond what can be offered for "application/json" documents.