如何在Dialogflow webhooks APIV2中返回列表？

const express = require('express');
const bodyParser = require('body-parser');

const app = express();
app.use(bodyParser.json());

app.post('/webhook', (req, res) => {
  const intentName = req.body.queryResult.intent.displayName;
  
  if (intentName === 'your_intent_name') {
    const listItems = ['Item 1', 'Item 2', 'Item 3'];
    
    const response = {
      fulfillmentText: 'Here is the list:',
      fulfillmentMessages: [
        {
          platform: 'ACTIONS_ON_GOOGLE',
          simpleResponses: {
            simpleResponses: [
              {
                textToSpeech: 'Here is the list:'
              }
            ]
          }
        },
        {
          platform: 'ACTIONS_ON_GOOGLE',
          listSelect: {
            title: 'List',
            items: listItems.map(item => {
              return {
                info: {
                  key: item,
                  synonyms: [item]
                },
                title: item
              };
            })
          }
        }
      ]
    };
    
    res.json(response);
  }
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});