Yes you can, you need a SAS expander, which is not cheap nor simple
There are SAS expander: 12, 16 ans 24 ports
mount the SAS expander internally and connect all the drives to it, you may need 8087 to 8088 cable and adapter to connect these together.
Or migrate your RAID10 to RAID5 so you can gain additional 2x drives space.
Don't worry the speed will be there and the raid still fail safe with 1x drive
Or start replace raid member with Largger drive and expand the raid volume
If you want to get more storage space