docs: def to_json(self, model):
          """Create a Json-like object for a model.
  
          Parameters
          ----------
          model : ModelHandle
  
          Returns
          -------
          dict
              Json-like object representation
          """
          # Get the basic Json object from the super class
          obj = super(DefaultModelRegistry, self).to_json(model)
          # Add model parameter
          obj['parameters'] = [
              para.to_json() for para in model.parameters
          ]
          obj['outputs'] = model.outputs.to_json()
          return obj