{
  "fields": [{"id":"_id","type":"int"},{"id":"กลุ่ม","type":"text"},{"id":"หน่วย","type":"text"}],
  "records": [
    [1,"กลุ่มวัยทำงาน","กลุ่ม"],
    [2,"กลุ่มทำธุรกิจ","กลุ่ม"],
    [3,"กลุ่มวัยเกษียณ","กลุ่ม"]
]}