curl --request POST \
  --url https://api.klavis.ai/sandbox/google_sheets/{sandbox_id}/initialize \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "spreadsheets": [
    {
      "properties": {
        "title": "<string>"
      },
      "sheets": [
        {
          "properties": {
            "title": "<string>",
            "index": 123,
            "gridProperties": {}
          },
          "data": [
            {
              "startRow": 0,
              "startColumn": 0,
              "rowData": [
                {
                  "values": [
                    {
                      "userEnteredValue": {}
                    }
                  ]
                }
              ]
            }
          ]
        }
      ]
    }
  ]
}
'

{
  "sandbox_id": "<string>",
  "status": "idle",
  "message": "<string>",
  "records_created": {}
}