This is for "app bundle", a new export format, which is not currently proposed by Construct.
So right this minute, you are still limited to a 100 mb APK.
You likely can already, at this time, export your project as an Android Studio project and pack it as app bundle from this software. This is out of the scope of Construct though and would require to check Android Studio's documentation to see how to do it.
This is interesting though, and I'm wondering what the dev team will have to say about it and if they feel they could incorporate this export type in an easy way in the Build Service.