Access to Google DNS servers via OpenVPN

Hello!

I have Asus RT-AC87U and Asuswrt-Merlin firmware 380.57.
I need to access to Google DNS servers 8.8.8.8 and 8.8.4.4 via OpenVPN tunnel.

I have this WAN DNS setting:
View attachment 5391

and these OpenVPN client policy routing rules:
View attachment 5392

Only one computer (192.168.0.3) in LAN (192.168.0.0/24) gets access to internet via VPN.
All other computers in the LAN gets direct access to internet via ISP.
DNS server for all computers in the LAN is set to...

Access to Google DNS servers via OpenVPN