[FHIR JSON-LD] Possible to generate implied triples from @context?

This question came up here:
https://lists.w3.org/Archives/Public/public-semweb-lifesci/2015Mar/0065.html

Is it possible to generate an RDF triple without an explicit property in 
the JSON-LD?  Instead of having to write:

{
   "@context" : "http://hl7.org/fhir/StructureDefinition/Substance",
   "resourceType": "Substance",
   ...
}

it would be nice if we could just write:

{
   "@context" : "http://hl7.org/fhir/StructureDefinition/Substance",
   ...
}

but still generate an RDF triple like:

   _:foo fhir:resourceType fhir:Substance .

Is this possible?

Thanks,
David Booth