HarmonyOS 鸿蒙Next 加载本地rowfile文件中的json数据，然后转成对象，怎么实现？

import { buffer } from '@kit.ArkTS';
buffer.from(jsonStr).toString();

示例如下

''
'
// a.json 的内容

{
  "a": [
    {
      "name": "module_desc",
      "value": "module description"
    },
    {
      "name": "EntryAbility_desc",
      "value": "description"
    },
    {
      "name": "EntryAbility_label",
      "value": "label"
    }
  ]
}

//获取rowfile文件并解析成对象
import { common } from '@kit.AbilityKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { buffer } from '@kit.ArkTS';

//构造对象
class TestObj {
  public a: TestobjOne[];
  constructor(a: TestobjOne[]) {
    this.a = a;
  }
}

class TestobjOne{
  public name:string ;
  public value: string;
  constructor(name:string ,value:string) {
    this.name = name;
    this.value = value;
  }
}

@Entry
@Component
struct Index {
  private context = getContext(this) as common.UIAbilityContext;

  build() {
    Column() {
      Button("获取rawFile文件").onClick(() => {
        try {
          let jsonUti8Arry = this.context.resourceManager.getRawFileContentSync("a.json");
          let JsonStr = buffer.from(jsonUti8Arry).toString();
          let Obj: TestObj = JSON.parse(JsonStr)
          //测试获取TestobjOne对象的name字段
          console.log(Obj.a[0].name)
        } catch (error) {
          let code = (error as BusinessError).code;
          let message = (error as BusinessError).message;
          console.error(`getRawFileContentSync failed, error code: ${code}, message: ${message}.`);
        }
      })
    }
    .width('100%')
    .height('100%')
  }
}