No, there is not, however Apple does have a framework for which how certain content is delivered to their devices, namely, software. Apple may define web-streaming games the same way it defines apps in the App Store.
From the very beginning, Apple’s real reason for prohibiting Flash on the iPhone and iPad was that they considered Flash to be a software delivery system, which it very much was, and Apple wasn’t going to allow that, even before the days of the App Store. Apple’s BS excuse about Flash being unreliable was just that - BS.