PowerPoint for .slk files? I think you mean Excel. It's possible to do, just very hard for a single person to find motivation to do so. Was the map you opened unprotected (i.e. it was protected and someone else used programs to deprotect it?) or was it already open source? If it was unprotected then it would use plain JASS rather than vJass, but oh well.
Projects take too much time and effort these days.