vue3的多语言如何改成异步按需请求语言文件?

vue3的多语言如何改成异步按需请求语言文件?

import {createI18n} from 'vue-i18n'
import zh from './zh'
import en from './en'

const i18n = createI18n({
    legacy: false,
    globalInjection: true,
    locale: localStorage.getItem('locale') || navigator.language.slice(0, 2),
    messages: {
        en,
        zh,
    }
});

export default i18n