如何在Keystone.js列表映射中指定多个字段？

const { Keystone } = require('@keystonejs/keystone');
const { Text, Relationship } = require('@keystonejs/fields');

const keystone = new Keystone();

keystone.createList('Post', {
  fields: {
    title: { type: Text },
    author: { type: Relationship, ref: 'User' },
  },
  labelResolver: item => `${item.title} by ${item.author.name}`,
  map: {
    name: item => `${item.title} by ${item.author.name}`,
    description: item => `This post was written by ${item.author.name}`,
  },
});

module.exports = {
  keystone,
};