I wanted to override the default DNS in WSL:

add the following section to /ect/wsl.conf (if not present create the file)

pnetwork]
generateResolvConf = false

Then restart wls (in powershell wsl --shutdown)

Create a normal resolv.conf file and add your dns settings.

I also made the file immutable since someone posted that it would be wiped clean on reboot:

sudo chattr +i resolv.conf