{"id":"fraction-calculator","engine":"core","category":"math","name":"คำนวณเศษส่วนแบบแม่นตรง","fields":[{"key":"a","label":"a","type":"text","default":"2/3","required":true},{"key":"b","label":"b","type":"text","default":"3/4","required":true},{"key":"operation","label":"การดำเนินการ","type":"select","default":"add","options":[{"value":"add","label":"บวก"},{"value":"subtract","label":"ลบ"},{"value":"multiply","label":"คูณ"},{"value":"divide","label":"หาร"}]}],"sample":{"a":"2/3","b":"3/4","operation":"add"}}