Read Testset Schema

curl --request GET \
  --url https://api.getscorecard.ai/v1/testset/{testset_id}/schema \
  --header 'X-API-Key: <api-key>'

{
  "variables": [
    {
      "data_type": "file_url",
      "description": "example file url",
      "name": "example_file_url",
      "role": "input"
    },
    {
      "data_type": "json_object",
      "description": "example json object",
      "name": "example_json_object",
      "role": "output"
    },
    {
      "data_type": "text",
      "description": "example text",
      "name": "example_text",
      "role": "label"
    }
  ]
}