{"id":"tax-calculator","engine":"core","category":"math","name":"Kalkulator podatku i VAT","fields":[{"key":"amount","label":"Kwota","type":"number","default":100,"required":true},{"key":"rate","label":"Stawka (%)","type":"number","default":20,"required":true,"min":0},{"key":"mode","label":"Tryb","type":"select","default":"net","options":[{"value":"net","label":"Dodaj podatek"},{"value":"gross","label":"Wyodrębnij zawarty podatek"}]}],"sample":{"amount":100,"rate":20,"mode":"net"}}