TL;DR

Is there a way to set the version number of a PWA (Progressive Web Application) in the manifest.json or service-worker.js file to override the default (1) to a custom number?

I've already tried adding a version key in manifest.json, but the version number stayed at 1.

{
  "version": 2
}

I've also tried to add a version variable in service-worker.js, like so. However, that didn't set the version correctly either.

const version = 2;

// Also tried...
const VERSION = 2;

So, is it possible to set the version number in a PWA?