Hey,
I don’t think, at least not yet. That being said, @fbartels recently reported on Kopano’s effort to implement CardDAV functionality in addition to the already-existing CalDAV functionality here. Looks like it’s in working shape already, but you still have to install it manually for the time being.
Edit: yeah well, I totally didn’t think of gabsync… obviously wrong answer is obviously wrong 
Kind regards,
mosu