Hi there -
i am looking to see if iOS apps and AppStore off the same functionality when it comes to Modularized mobile apps. In Android you can declare feature modules and they live separately from the base app. Once in the base app is download those modules can be downloaded as well via payment or for free.
An important thing to note is that these modules are not just content. There is actually executables or full feature set contained in a module.
reference: https://developer.android.com/guide/playcore/feature-delivery