Custom DNS on VPN?

Does anyone have any information on what I could edit to have custom DNS on VPN (without effecting my usual DNS set through the GLI UI)?

The GL UI option is the custom DNS for the VPN - so what are you trying to achieve?

DNS is a headache. But we are on it.

@Glitch the GL UI is DNS for the network, both VPN and regular internet traffic. I’m looking to use my VPN providers DNS whilst connected to VPN but the ISP DNS otherwise.

Good to hear @alzhao