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

airflow.serialization.serialized_objects.BUILTIN_OPERATOR_EXTRA_LINKS

airflow/serialization/serialized_objects.py
v = set(v)
            elif k == "subdag":
                v = SerializedDAG.deserialize_dag(v)
            elif k in {"retry_delay", "execution_timeout"}:
                v = cls._deserialize_timedelta(v)
            elif k in encoded_op["template_fields"]:
                pass
            elif k.endswith("_date"):
                v = cls._deserialize_datetime(v)
            elif k == "_operator_extra_links":
                op_predefined_extra_links = cls._deserialize_operator_extra_links(v)
                
                op_predefined_extra_links.update(op_extra_links_from_plugin)
                v = list(op_predefined_extra_links.values())
                k = "operator_extra_links"
            elif k in cls._decorated_fields or k not in op.get_serialized_fields():
                v = cls._deserialize(v)
            
            setattr(op, k, v)
        for k in op.get_serialized_fields() - encoded_op.keys() - cls._CONSTRUCTOR_PARAMS.keys():
            setattr(op, k, None)
        
        for field in op.template_fields:
            if not hasattr(op, field):
                setattr(op, field, None)
        
        setattr(op, "_is_dummy", bool(encoded_op.get("_is_dummy", False)))
        return op
    @classmethod
    def _is_excluded(cls, var: Any, attrname: str, op: BaseOperator):