如何将动态复杂 json 解析为dart 对象或模型

{
"transactionId": "11f8ecc05273e35a4eb2dc1a",
"type": "REQUEST_FOR_HH_INTERVIEW",
"answers": {
  "selectProvinceDistrictCommuneVillage": {
    "value": "01020706"
  },
  "positionOfOfficial": {
    "value": "Province Officer"
  },
  "enterKhmerName": {
    "value": "សុខ"
  },
  "selectSex": {
    "value": "MALE"
  },
  "dob": {
    "value": "1994-06-15T03:27:47.409Z"
  },
  "areYouMarried": {
    "value": "YES"
  },
  "scanSpousesID": {
    "value": "435465"
  },
  "enterSpousesKhmerName": {
    "value": "នារី"
  },
  "selectSexSpouse": {
    "value": "FEMALE"
  },
  "dobSpouse": {
    "value": "1996-08-15T03:27:47.409"
  },
  "numberOfMales": {
    "value": "4"
  },
  "numberOfFemales": {
    "value": "5"
  },
  "selectReasonForRequesting": {
    "value": [
      "NATURAL_DISASTER"
    ]
  }
}
}

这就是我需要解析到dart模型中的JSON.这个 struct 的问题是， map 内部的答案都是动态的.此外，答案中的 map 数量并不总是相同的.例如，下一个JSON响应可以是.

{
 "transactionId": "11f8ecc05273e35a4eb2dc1a",
 "type": "REQUEST_FOR_HH_INTERVIEW",
 "answers": {
   "selectCode": {
   "value": "01020706"
  },
  "selectRoomValue": {
  "value": "1996-08-15T03:27:47.409"
 },
 "numberOfFamilyMembers": {
  "value": "4"
  },
 "selectFoods": {
   "value": [
     "Piza",
     "Burger"
   ]
  }
 }
}

这与第一个react 不同.我需要制作一个dart模型来解析这两个响应.