It is not possible in current upstrem openssh version. But I worked on the patch that would provide this functionality for both client and server.
It is currently available for Fedora from copr repository. The patches are tracked in upstream bugzilla as bugs #1585 and #2468 and I would be glad for some feedback and testing.
Update: The bug #1585 was updated but openssh developer, so we can expect some progress in the close future.