source.parse_JSON( options ): implemented, documentation:

  Parses one JSON content field from a dataflow.

  If there is a parsing error, the destination field will containt a value with these
  attributes:
    - model: 'json_parse_error'
    - error: (String) the error message

  Parameters:
    - options: (Object) optional, attributes:
      - source_field: (String) the name of the source field to parse, defaults to 'content'
      - destination_field: (String) the name of the parsed field, defaults to 'source_field'