you can go the AS3 way but then you gonna have to program it
an .aab
is just a zip file with a structure close to an .apk
so you have to unzip it, go into base/assets/
and load your asset
whatever that is
the other 2 problems are to package the .aab
files
for this aapt2 can work I guess
and finally you need to figure out how to get the URL of that .aab
file
which should be deduced from the URL of the APK in the the store
not impossible but many things to figure out
also be ready for all these to change when Google will want to impose the new app bundle format (which share some but not all of the expansion format)