You can do what you want but the process would be specific and a bit onerous. But, before I get to that, let me show you what ROCK does when it rips a CD. First, it puts the ripped CDs in a different location than the rest of music you may have copied over to your ROCK NUC.
It puts it in the subdirectory as marked.

I have ripped a couple of CDs, and when you go into the CD-Rips directory this is what you would see (with different date/times).

Notice they are not grouped under any artist, nor is the album name used, it is just the date and time to the second for each disk ripped.
If you go under any of those disks, this is what you see…

No track name but at least a track number. No metadata is stored in any of these tracks, which means if you move them without first transferring the database between the servers, the new server would find them all looking like this.
When Roon rips a CD all the metadata is only contained in the database. If you wanted to move them to a new RoonServer, then, after you finished for the day, you would make a new database backup, copy it to the 2nd Roon Server and Restore the Database. Then, you would move the CD rips from the CD Rips directory of one server to the CD-Rips directory on the second server.
At that point, Roon hopefully picks up on the rips and all is well. There are a couple of other options…
Option 2:
Or, you use dbPoweramp to rip the cds. when you are done you copy them over the network to the storage location on the second server and Roon then scans and adds them to the library.
Option 3:
Or, you could rip the CDs on ROCK, export them to a USB drive, and either then, move that USB drive to the other server and let the other server load them into it’s library which means you would always be using this one external drive to serve as both the transport and storage media, or, if you wanted the exported files loaded on the second server’s internal drive, you would need to connect the “transport” drive to a computer and then copy the files from that drive to the ROCK NUC over the network.
I hope that helps and if you have any questions, please feel free to ask. Fellow user by the way, not official Roon staff.