@Bhav There is not at this point in time.
Secure boot is meant to be… well, secure.
There are people attempting to get there, but I can say, right now, FOG just isn’t there right now.
On the forums you can see this at:
https://forums.fogproject.org/topic/17949/fog-secure-boot-with-shim
Which might help lead you in the direction as well hopefully.