Are variable OpenType fonts supported in FOP 2.9?

Hi,

just a short question whether this is simply not support or whether I 
make some mistakes:

Are variable OpenType fonts using variable axes (like weight, width or 
slant) supported by FOP 2.9? Specifically, I want to use the NotoSans 
font family, and at least at Google's own site (fonts.google.com), the 
latest versions seem to be only available as variable fonts and not as 
separate files for the various weights.

Thanks in advance & greetings

Klaus