docs: def get_nested_dicts_with_key_containing_value(parent_dict: dict, key, value):
      """Return all nested dictionaries that contain a key with a specific value. A sub-case of NestedLookup."""
      references = []
      NestedLookup(parent_dict, references, NestedLookup.key_value_containing_value_factory(key, value))
      return (document for document, _ in references)