from cognite.client.data_classes import WorkflowUpsert
wf = WorkflowUpsert(external_id="my_workflow", description="my workflow description")
res = client.workflows.upsert(wf)

wf2 = WorkflowUpsert(external_id="other", data_set_id=123)
res = client.workflows.upsert([wf, wf2])

{
  "items": [
    {
      "externalId": "<string>",
      "createdTime": 1730204346000,
      "lastUpdatedTime": 1730204346000,
      "description": "<string>",
      "dataSetId": 4503599627370496,
      "maxConcurrentExecutions": 5000
    }
  ]
}