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Unconsciously I think I was waiting for some kind of a guide as well
But I think it may be straight forward and not much to do with Gideros itself.
Since Gideros provides you with the .aab build it should be only a matter of putting it on Google Store?
EDIT: isn't it good enough? https://wiki.gideros.rocks/index.php/Exporting_to_a_Player#Android
so if you have set up an apk export then changing to aab won't be a big deal.
Fragmenter - animated loop machine and IKONOMIKON - the memory game