Extra links supported for operators coming from third-party packages:

airflow.serialization.serialized_objects.BUILTIN_OPERATOR_EXTRA_LINKS

airflow/serialization/serialized_objects.py
if var is not None and op.has_dag() and attrname.endswith("_date"):
            
            
            dag_date = getattr(op.dag, attrname, None)
            if var is dag_date or var == dag_date:
                return True
        return super()._is_excluded(var, attrname, op)
    @classmethod
    def _deserialize_operator_extra_links(cls, encoded_op_links: list) -> Dict[str, BaseOperatorLink]: