Add service worker for expo web?

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I'd like to know how to create a service worker for the web part of the project. I build the web part using expo and I needed to eject the native parts of the project.

I'm trying to add FCM messaging to the web. I already added it to native part.

I've found this topic: https://github.com/expo/fyi/blob/master/enabling-web-service-workers.md
But even though the title says "enable service workers" it only shows how to enable workbox-specific plugin that expo comes bundled with.

Also -- It would surely work if I'd simply be able to add JS files to some kind of static assets directory (let's say web/public/file.js). All I want to have is have a service worker JS file with replaced env variables.
Firebase library should ensure that the service worker gets activated. So I should be good if I'd simply have a JS file that has needed authentification details added to it.

I'd like to also know how to eject the web from expo workflow. I know it's nice to have it but I simply want to add a static file to the project and there is no way to do it. There is no tutorial for it.

[iman2420]

Any solution?