capacity

Hey there. I have an RT-AX58U with the latest Merlin. AFAIK the partition/disk(?) size is limited by Asus. But even my cheaper router can handle my 6 TB HDD and this capacity in the 21st century it's not a "big deal". Is there any way or tweak to unlock this restriction on Merlin?

I have a RTAC88U and I recently made the mistake of purchasing a WD My Book that is 6 TB w/o realizing that the official firmware doesn't support >4 TB. I can't find any data on if Merlin can handle a larger capacity or not. Does anyone know? Thanks in advance!