code: def to_json(self):
      return json.dumps(self.to_dict())
  
imports: import os
  import sys
  import importlib.util
  from abc import ABC, abstractmethod
  import json
  import yaml
  import difflib
label_desc: Use image node_id 7 for calling the Loader obj's underlying member method code with example usage: obj.to_json() and returns: json