HarmonyOS Foreach循环渲染默认的key有问题

对于ObserverV2和Trace装饰的对象如何转成json字符串，参考以下示例：

import { plainToClass } from "class-transformer";

@ObservedV2
class Son {
  @Trace age: number = 100;
}

class Father {
  son: Son = new Son();
}

@Entry
@Component
struct Index {
  father: Father = new Father();

  aboutToAppear(): void {
    let a = JSON.stringify(this.father);
    let b: Father = plainToClass(Father, this.father);
    //{"son":{"__ob_age":100}}替换成{"son":{"age":100}}
    console.log(JSON.stringify(convertKeysToCamelCase(this.father)))
  }

  build() {
    Column() {
      // 当点击改变age时，Text组件会刷新
      Text(`${this.father.son.age}`)
        .fontSize(40)
        .onClick(() => {
          this.father.son.age++;
        })
    }
  }
}

// utils.ets
export function underscoreToCamelCase(underscoreString: string): string {
  // 捕获_ob替换成''
  return underscoreString.replace(/(_ob)/g, (match: string, letter: string): string => {
    console.log(letter)
    return '';
  });
}

export function convertKeysToCamelCase(obj: ESObject): ESObject {
  if (obj && typeof obj === 'object') {
    const newObj: ESObject = {};
    Object.keys(obj).forEach((key) => {
      if (obj.hasOwnProperty(key)) {
        const newKey = underscoreToCamelCase(key);
        newObj[newKey] = convertKeysToCamelCase(obj[key]);
      }
    })
    return newObj;
  } else {
    return obj;
  }
}