Coincidentally after asking my question earlier about the local nvme slots on main board; if you haven’t seen this yet check it out..
“Secondary Storage options (M.2 2230 socket)
Choose up to 2TB WD_BLACK™ SN770M NVMe™ M.2 2230 SSDs or bring your own
Note: The secondary storage interface supports x2 PCIe 4.0. SSDs with x4 PCIe 4.0 will run at slower speed.”