Run same code file again, even a different tab/file is focused

I would like to define a code file to be run with "Run Task", even when I have another tab / file open. Most of the time, a program/script consists of several files, but there is one starting-file/entry-point for a certain script.

Currently, I can define a "custom command" to run exactly that one file. But this is not convenient in case of different programs/scripts, because I have to re-define that custom command every time I switch projects.

It would be ideal if the first time I run a code file, Code Runner remembers that file and runs it even if I have another file open. To re-define the "last file to run", there might be another command / hotkey.

Or maybe there is some other way to achieve this already?