Seeing the manual page
here, the closest you are going to get is Spine files or SWF ones. Unless you can get your vectors into one of those(which doesn't seem worth the hassle to me), you are going to just need to render bitmap images from them.
I don't know why they don't currently support SVGs to be honest. It's a common enough format. And they seemingly have code to render vectors since they support them in these other formats. I'm guessing that maybe they are using 3rd party code to handle those and don't have such code for SVGs.