from cognite.client.data_classes.hosted_extractors import DestinationWrite, SessionWrite
destination = DestinationWrite(external_id='my_dest', credentials=SessionWrite("my_nonce"), target_data_set_id=123)
res = client.hosted_extractors.destinations.create(destination)

{
  "items": [
    {
      "externalId": "my.known.id",
      "createdTime": 1730204346000,
      "lastUpdatedTime": 1730204346000,
      "sessionId": 4503599627370496,
      "targetDataSetId": 4503599627370496
    }
  ]
}