How many use Pi-hole and a VPN? And if so, how do you configure them together?

I installed Pi-hole however it seems I am unable to use a VPN (Mullvad/ExpressVPN/etc).

Is there a beginner-friendly guide on how to set up/use a VPN and Pi-hole together? Example: my PC (sends a DNS request to site) → Pi-hole (blocks trackers/DNS requests) → VPN (for IP address and stops DNS leaks ) → Internet