how to "retype" rdf:JSON to geo:geoJSONLiteral?

https://w3c.github.io/json-ld-syntax/#json-literals shows how a piece of the JSON can be captured as datatyped literal "..."^^rdf:JSON

@situx @nicholascar @mathib @dr-shorthair
https://github.com/opengeospatial/ogc-geosparql/issues/1 discusses the new GeoSPARQL 1.1 geo:geoJSONLiteral. According to the standard, such geometry serialization must both be connected by a specific property, and carry a specific datatype:

<geometry> geo:asGeoJSONLiteral "..."^^geo:geoJSONLiteral

@gkellogg Is it possible to somehow "retype" a rdf:JSON literal to a specific datatype geo:geoJSONLiteral?
It's easy enough to do this post-factum (eg with a SPARQL update), but seems unsatisfactory...

Perhaps something like this can be added:

"@context": {
    "@version": 1.1,
    "geo": "http://www.opengis.net/ont/geosparql#",
    "myGeom": {"@id": "geo:asGeoJSONLiteral", "@type": "@json", "@json": "geo:geoJSONLiteral"}
}

Notice the last key: this is similar to "@nest": "labels" in https://w3c.github.io/json-ld-syntax/#example-defining-property-nesting

Read the JSON-LD 1.1 JSON literals section and the GeoSPARQL 1.1 geo:geoJSONLiteral definition linked in the issue, then compare them with the proposed @context syntax. Determine whether retyping rdf:JSON is supported or requires a specification change. Done means a documented resolution with any needed syntax or examples agreed by the working group.