display: standalone on webpack manifest

Hello guys, I had a project with laravel+vue+buefy+bulma, and I want to add on my mix-manifest.json the "display": "standalone", how can I do it with webpack

this is my webpack.mix.js

const mix = require('laravel-mix');

mix.js('resources/js/app.js', 'public/js')
   .sass('resources/sass/app.scss', 'public/css')
   .version();

and here the webpack output (mix-manifest.json):

{
    "/js/app.js": "/js/app.js?id=94278db0cc2a3a9ba5d8",
    "/css/app.css": "/css/app.css?id=d41d8cd98f00b204e980"
}

if I manually change the manifest and add the "display": "standalone" it works, but I guess it is not the easy way to do that.