In WSL 2, get IP address:
ip addr show eth0
E.g., 172.23.99.247
In PowerShell, get interface ID:
netstat -r | findstr Hyper-V
E.g., 40
In elevated PowerShell, add a route:
route add 172.23.99.247 mask 255.255.255.255 172.23.99.247 metric 256 if 40
In WSL 2, test connectivity:
ping 1.1.1.1