how to prioritize windows process to WSL tasks?

I have a Windows OS, with a WSL installed. I am running some computation heavy processes in WSL, written in Fortran, submit using nohup, which usually takes 10 hours to complete a task.

I wanted to simultaneously submit, say 30 tasks. But I want to leave at least one core (or thread) free for my windows processes (like my browser and OriginPro).

Is there a way to submit jobs in WSL that limit to only n-1 number of cores/threads?Or even better, prioritize windows tasks so that my WSL processes gets the lowest priority (similar to nice).

Thanks