Jass to GUI?

Is there a way to convert JASS triggers into GUI triggers?

Nope

Simply becouse the GUI doesn't have all the things you do in JASS, like local variables, all the native functions, advanced loops. So, no, not possible, sure there can be made scripts that try to do this, but....they'll never make it easy enough for you to pick it up and edit it. Atleast if the script was HeavyLocked (obfuscated).

Cubasis

Yes but not all JASS trigs can be converted into GUI trigs, and that way is manually - currently no program (that is nonpvt) can convert custom text to GUI trigs.