Nuxt.js，如何将Sitemap.xml添加到动态路由？

import axios from 'axios';

export default {
  // 生成Sitemap的路由
  async routes() {
    const { data } = await axios.get('https://api.example.com/posts');
    return data.map(post => `/posts/${post.id}`);
  },
  // Sitemap的配置
  sitemap: {
    hostname: 'https://www.example.com',
    gzip: true,
    exclude: ['/admin/**'],
    routes: async () => {
      const { data } = await axios.get('https://api.example.com/posts');
      return data.map(post => `/posts/${post.id}`);
    }
  }
}

export default {
  modules: [
    '@nuxtjs/sitemap',
  ],
  sitemap: {
    path: '/sitemap.xml',
    hostname: 'https://www.example.com',
    gzip: true,
    exclude: ['/admin/**'],
    routes: async () => {
      const { data } = await axios.get('https://api.example.com/posts');
      return data.map(post => `/posts/${post.id}`);
    }
  },
  // 其他配置项...
}

nuxt generate