Calibre Interactive can get the transcript named as <Primary cell>.log by using the triggers available. Here is a small post-execution trigger that changes transcript file name from drc.log to <Layout Primary cell name>.log.
Launch Calibre Interactive DRC.
Set the transcript to a standard name, here drc.log is used:
With Transcript > Echo to file
set "Echo to transcript file" on
set Path field
set "Replace File" on
Use the Post-execution trigger to change drc.log to <Layout Primary cell>.log:
With Setup > Preferences > Triggers
set Calibre Post-Execution Trigger to
mv drc.log %L.log
Save the runset.
The runset you just saved should now include these lines:
*cmnPostTrigger: mv drc.log %L.log