Greetings.
The NVME devices currently have their own PCI-E controller, and do not use scsi/sas commands.. As such they are NOT plugged into the standard 6Gb or 12GB sas/sata raid controllers.
I expect that we'll see more hybrid controllers become available that will have this functionality for NVME raid, but for now, you will have to use OS level software raid (if the OS supports it).
Should note that Broadcom/avago/LSI does have a trimode 9400 series controller that looks to have this functionality.
Not sure when/if there will be a related model that gets added to tested/approved spec list.
Thanks,
Kirk...