You are indeed correct in your findings: as it currently stands the Web Portal feature is only available with our Test Studio for iOS mobile testing product.
As far as implementation of this type of feature with Test Studio standalone, I have submitted your idea to our Feedback Portal in the form of a feature request
We have had customers successfully implement their own similar feature to aggregate results. I believe this link
to our documentation for creating execution extensions will be useful for helping you do so as well.
the Telerik team