通过hbuilderx创建的uniapp项目怎么引入babel插件？

我看在HBuilderX\plugins\uniapp-cli下有个babel.config.js，但是里面的内容是这样的，如下

const plugins = []  

if (process.env.UNI_OPT_TREESHAKINGNG) {  
    plugins.push(require('@dcloudio/vue-cli-plugin-uni-optimize/packages/babel-plugin-uni-api/index.js'))  
}  

if (  
  (  
    process.env.UNI_PLATFORM === 'app-plus' &&  
    process.env.UNI_USING_V8  
  ) ||  
  (  
    process.env.UNI_PLATFORM === 'h5' &&  
    process.env.UNI_H5_BROWSER === 'builtin'  
  )  
) {  
  const path = require('path')  

  const isWin = /^win/.test(process.platform)  

  const normalizePath = path => (isWin ? path.replace(/\\/g, '/') : path)  

  const input = normalizePath(process.env.UNI_INPUT_DIR)  
  try {  
    plugins.push([  
      require('@dcloudio/vue-cli-plugin-hbuilderx/packages/babel-plugin-console'),  
      {  
        file (file) {  
          file = normalizePath(file)  
          if (file.indexOf(input) === 0) {  
            return path.relative(input, file)  
          }  
          return false  
        }  
      }  
    ])  
  } catch (e) {}  
}  

process.UNI_LIBRARIES = process.UNI_LIBRARIES || ['@dcloudio/uni-ui']  
process.UNI_LIBRARIES.forEach(libraryName => {  
  plugins.push([  
    'import',  
    {  
      'libraryName': libraryName,  
      'customName': (name) => {  
        return `${libraryName}/lib/${name}/${name}`  
      }  
    }  
  ])  
})  
module.exports = {  
  retainLines: process.env.NODE_ENV !== 'production',  
  presets: [  
    [  
      '@vue/app',  
      {  
        modules: 'commonjs',//可支持 module.exports 与 import 混搭使用  
        useBuiltIns: process.env.UNI_PLATFORM === 'h5' ? 'usage' : 'entry',  
        exclude: ['transform-typeof-symbol']  
      }  
    ]  
  ],  
  plugins  
}

我想用babel编译es2020的语法，想加下面的几行代码，要怎么加进去呢？
module.exports = {
presets:[
'@vue/cli-plugin-babel/preset'
],
plugins:[
"@babel/plugin-proposal-optional-chaining"
]
}