I have 4 bay My Cloud Ex4100 and want two difetents raid 01

Hi, I have 4 bay my cloud with one RAID 01, and two Jbod disks. I want to change those two JBOD disk into another RAID01 Disk to have two differents disk RAID 01. The only way I imaging to do that is disconecting the two disks on the RAID 01 already working and let inside the two JBOD disk to convert them to RAID01. It is possible to do THAT?