As title says.

I've followed this guide, everything is working as desired but I got myself thinking if it'd be possible in the future to add a second nvme (I have a 1 TB nvme now). I've googled a little but all that I found so far apparently was about expanding the very same drive used in the installation, not adding a second one.

Could anyone more experienced tell me if that's is possible in this context and, if so, point me in the right direction?