{"id":"percentage-change","engine":"core","category":"math","name":"การเปลี่ยนแปลงเป็นเปอร์เซ็นต์","fields":[{"key":"before","label":"ค่าเดิม","type":"number","default":80,"required":true},{"key":"after","label":"ค่าใหม่","type":"number","default":100,"required":true}],"sample":{"before":80,"after":100}}