Can app.notFound be customized for each Hono instance?

import { Hono } from 'hono';
import { serve } from '@hono/node-server';

const foo1 = new Hono();
foo1.get('/bar', (c) => c.text('foo1, bar'));
foo1.notFound((c) => c.text('foo1, not found'));

const foo2 = new Hono();
foo2.get('/bar', (c) => c.text('foo2, bar'));
foo2.notFound((c) => c.text('foo2, not found'));

const app = new Hono();
app.route('/foo1', foo1);
app.route('/foo2', foo2);
app.notFound((c) => c.text('app, not found'));

serve({
  fetch: app.fetch,
  port: 28080
});