Mathematica is excellent tool but I don't know if is it possible to create Android App Bundle (aab) for Google play with Wolfram language/Mathematica or not? Please advise or share your opinion/idea for this.
Wolfram Inc. changes this concept rather often but since some time the API are gathered into the Wolfram Alpha Pro product. The central page for product information is https://products.wolframalpha.com/api/. The learning path doing this is harder than coping with Wolfram Alpha Pro. You have to work rapidly with the Google Android API. The start is always on the Google Play Store and then make Yourself a Google Android Developer taking the Google course path to obey their strict app requirement policies and security policies.
From both starting points this community may not be the very best starting point. Seems a new topic. All the best.
The given link allows detailed API searches for the type of apps that are reasonable to Wolfram Inc. For example on Intelligent Assistent they show API Rest code that is central to this type of Intelligent Assistant with Wolfram Alpha Pro. Like Google Developer API they work with templates that allow only for specialized and strongly typed app skeletons. Nevertheless, this may lead to very rich and nice adopted apps.
You can not go around making Yourself a Google Play Store Developer for broad Android purposes. To get on the faster learning track and not to spend too much money on App hosting and SEO capabilities far beyond the Google Android package head to MIT Appinventor. These offer a free-of-charge entry level for developing a first-level stub to upload on the Google Play Store.