Javascript alert() not working in Axure Cloud App

I’ve been using the Axure Cloud iOS app to view my prototype on my iPhone. Sometimes I set my Open Link target to a javascript:alert() function to easily display a message. It doesn’t appear to work in the app. Am I doing something wrong, or is that a limitation of the Axure Cloud app?

Upon further research it appears this is an issue with WKWebView is iOS apps. There appear to be workarounds, but Axure developers would have to modify the app for that.