1mutation followById($collectionType: String!, $collectionId: String!) {
2  followById(collectionType: $collectionType, collectionId: $collectionId) {
3    id
4    message
5  }
6}

1{
2  "collectionType": "collectionType",
3  "collectionId": "collectionId"
4}

1{
2  "followById": {
3    "id": "08a16b83-9094-4e89-8c05-2ccadd5c1c7e",
4    "message": "message"
5  }
6}