Hi, I'm trying to set it up so that cloudflared DoH uses mullvad dns but I don't know how
This doesn't involve Pi-hole.
Commonly, VPN service providers forcefully redirect DNS traffic to their own DNS servers in an effort to avoid DNS leakage.
You should inquire with your VPN provider's support on further details on if and how it would be possible to use a custom DNS server with their service.
If you are not using Mullvad's VPN service, but rather want to just use their DNS servers, you may have to inquire with them as well, whether they would allow public access to their DNS servers or whether they would restrict access to VPN service subscribers only, and whether they would support DoH access as required by cloudflared or not.
It does because I followed the DoH cloudglated guide from pi hole in the documentation
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