curl --request PATCH \
  --url https://api.example.com/api/flow_runs/{id}/labels \
  --header 'Content-Type: application/json' \
  --data '{}'

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>"
    }
  ]
}