Describe the inspiration for your proposal

I have JSON schemata, which contain URIs to further data (mostly further JSON and/ or XML, sometimes ZIPed before).
It would be helpful to have a way to define in which format this data, so people know what they can and have to support when following the data.

Describe the proposal

We already have https://json-schema.org/understanding-json-schema/reference/non_json_data#contentmediatype and https://json-schema.org/understanding-json-schema/reference/non_json_data#contentschema .
If the type is string and format is one of https://json-schema.org/understanding-json-schema/reference/string#resource-identifiers, allow to provide resourceMediaType and resourceSchema following the same rules like contentMediaType and contentSchema.

Describe alternatives you've considered

I first thought about using contentMediaType and contentSchema, but this is meant for the content to be the string, not the string being the reference to it.
This might cause trouble with existing tooling.

Additional context

No response