How to exclude a nested path from sitemap?

[isc30]

I want to exclude everything under /app from the sitemap, is there any way to use a function or regex on the path property of pages?

tanstackStart({
  prerender: {
    enabled: true,
    crawlLinks: false,
  },
  sitemap: {
    enabled: true,
    host: 'https://example.com',
  },
  pages: [
    {
      path: "/app/.*", // here, how can I exclude everything under `/app/`?
      sitemap: {
        exclude: true,
      },
    },
  ],
}),