curl --request GET \
  --url https://api.timbal.ai/orgs/{org_id}/projects/{project_id}/vars \
  --header 'Authorization: Bearer <token>'

{
  "vars": [
    {
      "envs": [
        {
          "color": "<string>",
          "id": 123,
          "name": "<string>"
        }
      ],
      "id": 123,
      "name": "<string>",
      "value": {
        "type": "plain",
        "value": "<string>"
      },
      "description": "<string>"
    }
  ]
}