code: def add_synonyms_from_entities(
      plain_text: Text,
      entities: List[Dict],
      existing_synonyms: Dict[Text, Any],
  ) -> None:
      """Adds synonyms found in intent examples.
  
      Args:
          plain_text: Plain (with removed special symbols) user utterance.
          entities: Entities that were extracted from the original user utterance.
          existing_synonyms: The dict with existing synonyms mappings that will
                             be extended.
      """
      for e in entities:
          e_text = plain_text[
              e[ENTITY_ATTRIBUTE_START] : e[ENTITY_ATTRIBUTE_END]
          ]
          if e_text != e[ENTITY_ATTRIBUTE_VALUE]:
              add_synonym(
                  e_text, e[ENTITY_ATTRIBUTE_VALUE], existing_synonyms
              )
  
label_desc: Use image node_id 1 for calling a global function with example usage: add_synonyms_from_entities(plain_text, entities, existing_synonyms) without return types