code: def layout_json_params(self):
          
          if self._layout_json_params is None:
              self._layout_json_params = {}
              for i in self.layout_json.get('inputs', []):
                  for p in i.get('parameters', []):
                      self._layout_json_params.setdefault(p.get('name'), p)
          return self._layout_json_params
docs: Return layout.json params in a flattened dict with name param as key.