The Windows Subsystem for Linux (or WSL for short) allows you to run Linux programs on a Windows system.
Darling should work with no problems on WSL2, as this is essentially a standard virtual machine with a full Linux kernel. WSL1 is more complicated and is not currently working.
As Darling no longer uses a Linux Kernel Module, no special instructions are needed for either WSL1 or WSL2. Use the standard Linux build instructions.