curl --request PUT \
  --url https://api.example.com/api/datasets/{dataset_id}/reviewers \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "reviewer_ids": [
    123
  ],
  "rules": {
    "min_validations": 5
  }
}
'

{
  "reviewers": [
    {
      "id": 123,
      "email": "<string>",
      "name": "<string>",
      "roles": []
    }
  ],
  "source": "none",
  "rules": {
    "access_mode": "dataset_editors",
    "min_validations": 1
  }
}