This seems to have come up a few times, but it looks like someone started support years and years ago, but never really got anywhere.
The devs don’t seem to be interested in supporting them, fair enough, so I chose to sidestep the issue entirely 
Inkscape is a really fantastic tool, so this combines the relative strengths of each.
A side note for another discussion: I honestly believe that SVG would be a fantastic file format for a PCB tool on its own.