docs: def to_dict(self, model):
          """Create a dictionary serialization for a model.
  
          Parameters
          ----------
          model : ModelHandle
  
          Returns
          -------
          dict
              Dictionary serialization for a model
          """
          # Get the basic Json object from the super class
          obj = super(ModelRegistry, self).to_dict(model)
          # Add model parameter
          obj['parameters'] = [
              para.to_dict() for para in model.parameters
          ]
          obj['outputs'] = model.outputs.to_dict()
          obj['connector'] = model.connector
          return obj