This is a quite new feature that was implemented to replace Expansion Files (.obb) and uses the Android App Bundle export.
Here is the Google documentation for the Play Asset Delivery:
developer.android.com/guide/app-bundle/asset-delivery
Does it work with Construct 3 '.aab' export already? It would be extremely useful to surpass the 150MB limit on the Play Store.
Thanks!
Edit: Corrected Android Asset Bundle to Android App Bundle