HarmonyOS 鸿蒙Next TaskPool执行任务的函数装饰器疑问：@Concurrent是否必需于类定义中

具体使用参考如下代码：

// sendable.ets

// 定义模拟类Test，模仿开发过程中需传递带方法的class

import { lang, collections  } from '@kit.ArkTS'
export type ISendable = lang.ISendable;
[@Sendable](/user/Sendable)
export class SendableTestClass {
  name: string = 'John';
  age: number = 20;
  sex: string = ""man"";
  arr: collections.Array<number> = new collections.Array<number>(1, 2, 3);
  constructor() {
  }
  setAge(age: number) : void {
    this.age = age;
  }
  printName(): string {
    return this.name;
  }
  printAge(): number {
    return this.age;
  }
  printSex(): string {
    return this.sex;
  }
}

// Index.ets

import { taskpool, ArkTSUtils } from '@kit.ArkTS'
import { SendableTestClass, ISendable } from './sendable'
// 在并发函数中模拟数据处理
[@Concurrent](/user/Concurrent)
async function taskFunc(sendableObj: SendableTestClass) {
  console.info(""SendableTestClass: name is: "" + sendableObj.printName() + "", age is: "" + sendableObj.printAge() + "", sex is: "" + sendableObj.printSex());
  sendableObj.setAge(28);
  console.info(""SendableTestClass: age is: "" + sendableObj.printAge());
  // 解析sendableObj.arr数据生成JSON字符串
  let str = ArkTSUtils.ASON.stringify(sendableObj.arr);
  console.info(""SendableTestClass: str is: "" + str);
  // 解析该数据并生成ISendable数据
  let jsonStr = '{""name"": ""Alexa"", ""age"": 23, ""sex"": ""female""}';
  let obj = ArkTSUtils.ASON.parse(jsonStr) as ISendable;
  console.info(""SendableTestClass: type is: "" + typeof obj);
  console.info(""SendableTestClass: name is: "" + (obj as object)?.[""name""]); // 输出: 'Alexa'
  console.info(""SendableTestClass: age is: "" + (obj as object)?.[""age""]); // 输出: 23
  console.info(""SendableTestClass: sex is: "" + (obj as object)?.[""sex""]); // 输出: 'female'
}
async function test() {
  // 使用taskpool传递数据
  let obj: SendableTestClass = new SendableTestClass();
  let task: taskpool.Task = new taskpool.Task(taskFunc, obj);
  await taskpool.execute(task);
}
test();

由于[@Concurrent](/user/Concurrent)装饰器不支持类成员函数或者匿名函数，所以不能在自定义类中使用