I am not too familiar with C/++, nor with VGMTrans' hierarchy and development structure (and GUI development would probably factor into adding that as well, which is completely alien to me), so probably not. You can submit an issue at Github and ask loveemu or whoever to implement support (they can use kdt-tool as a reference). He hasn't been active with the project for months though, so keep your fingers crossed if you do.
I would've liked to fix its SF2 converter myself, since it's broken, but C++ is such a messy language for me, and I don't even understand half of how the converter comes together. Everything is just too scattered for me to work with.