Easiest way to add code assist support for a client-side JS framework

I have just recognized that IntelliJ offers strong support for the JavaScript language;
but how can I add code assist support for client-side JavaScript frameworks - like
e.g. SmartClient - into the mix ? With SmartClient, I have the choice to author against XML
OR JavaScript; I would like to have full IntelliJ support for SmartClient authoring
against JavaScript OR XML; the information is already there in the form of a comprehensive
XML file.
Can I just feed the info from such a XML file into an IntelliJ project, or do I have to
develop a dedicated plugin or whatsoever ?

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