js_ templates cannot be choosen in inline gallery settings

[sixtmedia]

I'd like to use an alternative lightbox with isotope (in my case, the inspiredminds/contao-glightbox extension). But it's not possible to choose other than j_ and moo_ templates in the inline gallery settings.
Adding the js_ templates in the tl_iso_gallery.php file or renaming the tamplates is not working.

It would be nice to have a wider choice between other lightbox scripts.