The playground has only allowed JSON-LD to be used as an input, or a context. Given other formats (YAML-LD and CBOR-LD), it would be useful to be able to specify the input as an alternative format. For CBOR-LD, this should probably use an ASCII visualization of the binary form (Annotated HEX and/or Diagnostic Notation).

The input should also allow an RDF format as input. Nominally, N-Quads, but TriG would also be useful. It would also be nice to be able to view the output as TriG. when appropriate.