Rockwell had a conversion tool at one time that would do some rough conversion for Wonderware Intouch.
But despite both now being owned by the same company and briefly sharing a similar product name with Wonderware, there's no such thing for Indusoft Web Studio.
Also, Indusoft offered a FactoryTalk/RSView import and conversion tool, but not the other way around.
In general, Indusoft has so many features that are absent or different in FactoryTalk View, that conversion in that direction is going to be a hefty amount of labor.
One important difference is that Indusoft uses VBScript as its scripting language, which is available all the way up and down the product line. FactoryTalk View SE uses Visual Basic for Applications (VBA), but only in the FTView SE version.
So much of the syntax will be similar-but-different, and if you're converting an Indusoft Web Studio application to FactoryTalk View Machine Edition (used on the PanelView Plus), you will probably find features or functions in the existing system that you cannot easily implement in the new one.