no doubt [scriptable] is an amazing app. but, will it be possible 2 support JSX in the future? writing layout in code killing me truly. 
I am guessing that there will never be JSX support but you can use different scripts to enable the support for styling widgets without code.
Here is a JSX script on GitHub https://gist.github.com/bsehovac/e8fd512bb89ea51fb1ae5ab5a19bdc3a
I made a simple markup simulator for making scriptable widgets: GitHub - rafaelgandi/WidgetMarkup-Scriptable: Simple implementation of markup for Scriptable widgets.
Its no JSX but it might help you out 