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

airflow.serialization.serialized_objects.BUILTIN_OPERATOR_EXTRA_LINKS

airflow/serialization/serialized_objects.py
from kubernetes.client import models as k8s
    from airflow.kubernetes.pod_generator import PodGenerator
    
    HAS_KUBERNETES = True
except ImportError:
    HAS_KUBERNETES = False
log = logging.getLogger(__name__)
FAILED = 'serialization_failed'
BUILTIN_OPERATOR_EXTRA_LINKS: List[str] = [
    "airflow.providers.google.cloud.operators.bigquery.BigQueryConsoleLink",
    "airflow.providers.google.cloud.operators.bigquery.BigQueryConsoleIndexableLink",
    "airflow.providers.google.cloud.operators.mlengine.AIPlatformConsoleLink",
    "airflow.providers.qubole.operators.qubole.QDSLink",
    "airflow.operators.dagrun_operator.TriggerDagRunLink",
    "airflow.sensors.external_task_sensor.ExternalTaskSensorLink",
]
class BaseSerialization:
    """BaseSerialization provides utils for serialization."""
    
    _primitive_types = (int, bool, float, str)
    
    
    _datetime_types = (datetime.datetime,)
    
    _excluded_types = (logging.Logger, Connection, type)
    _json_schema: Optional[Validator] = None
    _CONSTRUCTOR_PARAMS: Dict[str, Parameter] = {}
    SERIALIZER_VERSION = 1
    @classmethod
    def to_json(cls, var: Union[DAG, BaseOperator, dict, list, set, tuple]) -> str: