HarmonyOS media模块下SoundPool如何调用flutter asset目录下的音频文件

SoundPool接口load方法只提供下面4个重载方法,现在音频文件放在flutter的asset目录中，该如何调用这些音频文件？(非必要不想把音频文件放到HarmonyOS工程的目录下)

load(uri: string, callback: AsyncCallback<number>): void;
load(uri: string): Promise<number>;
load(fd: number, offset: number, length: number, callback: AsyncCallback<number>): void;
load(fd: number, offset: number, length: number): Promise<number>;