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

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