curl --request GET \
  --url https://api.promptlayer.com/workflows/{workflow_id_or_name}/labels \
  --header 'X-API-KEY: <x-api-key>'

{
  "success": true,
  "release_labels": [
    {
      "release_label": "<string>",
      "release_label_id": 123,
      "workflow_version_id": 123,
      "workflow_version_number": 123
    }
  ]
}