Config.json url file

Hellow there i have some problem with configuring config.production.json with local portal
here is code

“portal”: {
“url”: “file:///var/www/ghost_site/content/portal.min.js”,
“version”: “1.14”
},

i put portal file from
https://unpkg.com/@tryghost/portal@~1.14.0/umd/portal.min.js
and set as URI local file path but it not work i try also

file://localhost/var/www/ghost_site/content/portal.min.js

but same
thatnks for any help