curl --request GET \
  --url https://studio.edgeimpulse.com/v1/api/{projectId}/performance-calibration/ground-truth \
  --header 'x-api-key: <api-key>'

{
  "success": true,
  "samples": [
    {
      "labelIdx": 123,
      "labelString": "<string>",
      "start": 123,
      "length": 123,
      "samples": [
        {
          "id": 123,
          "start": 123,
          "length": 123,
          "idx": 123
        }
      ]
    }
  ],
  "error": "<string>"
}