const r = await mn.api('/anki/jobs/' + jobId);
if (r.error) mn.log(r.error.code);

{
  "jobId": "anki-3F1A2B40",
  "state": "finished",
  "operation": "export",
  "artifacts": [
    {
      "name": "collection.apkg",
      "mimeType": "application/octet-stream"
    }
  ]
}

{
  "error": {
    "code": "NOT_FOUND",
    "message": "找不到目标对象。"
  }
}