HarmonyOS Json字符串包含数字key，应该如何编写数据类，类型是什么？

参考以下demo，不固定的key用string获取再给他转换：

export class ResponseResult {
  statues_code: number = 0
  result: Reusult = new Reusult()
}

export class Reusult {
  max_rank_tags: string = ''
}

export class ShopInfo {
  shop_id: number = 0
}

@Component
@Entry
struct Index {
  @State str: string =
    '{"status_code": 200,"result": { "max_rank_tags": { "215123565": { "shop_id": 215123565,"rank_name": "热门商家榜-月度","rank_no": 1,"rank_item_name": "月度签单量","rank_item_score": "1","rank_over_percent": 0,"station_name": "上海","rank_id": 10,"in_rank_num": 1 } } }}'
  get() {
    let a: ResponseResult = JSON.parse(this.str) as ResponseResult
    let c: string = JSON.stringify(a.result.max_rank_tags)
    let jsonRecord: Map<string, ShopInfo> = new Map(Object.entries(JSON.parse(c)))
    jsonRecord.forEach((value, key) => {
      console.log("key:" + key)
    })
  }
  build() {
    Text('asadasd').onClick(() => {
      this.get()
    })
  }
}