docs: def insert_element_to_dict_of_dicts_of_list(dict_of_dict_of_list, first_key, second_key, parser):
      """
      Utility method
  
      :param dict_of_dict_of_list:
      :param first_key:
      :param second_key:
      :param parser:
      :return:
      """
      list_to_insert = parser if isinstance(parser, list) else [parser]
  
      if first_key not in dict_of_dict_of_list.keys():
          dict_of_dict_of_list[first_key] = {second_key: list_to_insert}
      else:
          if second_key not in dict_of_dict_of_list[first_key].keys():
              dict_of_dict_of_list[first_key][second_key] = list_to_insert
          else:
              dict_of_dict_of_list[first_key][second_key] += list_to_insert