{"id":"tax-calculator","engine":"core","category":"math","name":"Calculer une taxe ou la TVA","fields":[{"key":"amount","label":"Montant","type":"number","default":100,"required":true},{"key":"rate","label":"Taux (%)","type":"number","default":20,"required":true,"min":0},{"key":"mode","label":"Mode","type":"select","default":"net","options":[{"value":"net","label":"Ajouter la taxe"},{"value":"gross","label":"Extraire la taxe incluse"}]}],"sample":{"amount":100,"rate":20,"mode":"net"}}