Motivation Behind Feature
Google recommends using the new Android App Bundle format for apps uploaded to Google Play. When you upload an APK a warning is displayed which encourages to use the newer format.
Feature Description
Google provides information on the new package format on:
https://developer.android.com/platform/technology/app-bundle
It would be great if Outsystems would support this new package format.
My vote for you.
AAB seems more feasible in terms of download & installation.
We will add support for this :)