Feature Request: Friendlier extension JSON for non-standard JSON consumers

Currently, this project's JSON printer produces complex and deeply nested json for extensions (as per the standard). It would be nice if the printer produced a simpler JSON, for i.e. clients that were willing to accept non-standard FHIR.

One could imagine running the standard protobuf json printer to simplify printing of extensions, but then again the overall JSON becomes more complex (with lots of nested "value").