Generate a Korean quotation (견적서) as XLSX with VAT and amount in Korean words

Example request

{
  "from": {
    "name": "다고툴즈",
    "business_number": "280-30-01413",
    "representative": "박지훈",
    "phone": "010-2101-6758"
  },
  "to": {
    "name": "(주)예시상사"
  },
  "date": "2026-10-12",
  "items": [
    {
      "name": "웹사이트 제작",
      "spec": "반응형",
      "qty": 1,
      "unit_price": 1500000
    },
    {
      "name": "유지보수",
      "spec": "월",
      "qty": 3,
      "unit_price": 100000
    }
  ],
  "vat": "separate"
}