[firebase_messaging] How to add messaging support to newer PWA-enabled index.html

[davebound]

The WEB tab in this explains how to add FCM functionality to a flutter WEB app:

But the structure of the index.html created by "flutter create" changed significantly around flutter 2.2 when better support was added for PWA (I think).

The part of index.html that downloads main.dart.js now looks like this: main.dart.js now looks like this:

So... how should we add support for FCMs to this new version of index.html? My understanding is that since flutter is already using a service worker for PWA, it is not possible to add another service worker in the same scope to support messaging.

Thanks