Is there a way to access the world bounding box or extantHints within the Karma material builder? I'd like to use the scale of an asset to drive the scale of the texture being applied to it.

I can create an attribute in SOPs to drive the scale, but the bounding box is sitting right there and it seems like I should be able to grab it directly, but I've tried all the variations I can think of and can't seem to access it.