There is no GUI option to set this. Shouldn't be too difficult to add.
If you'd like to review the code and submit a Pull Request we will review it.
Pending implementation of such a feature, you can edit /etc/pihole/setupVars.conf
and add as many custom upstream DNS servers as you like.
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This is a feature of the new web interface, which is not yet released.
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Outdated
~~https://github.com/pi-hole/web/pull/115~~
Would you be kind enough to give an example? Is it implemented yet?
variable name?
1/2/1/2 or 1/1/2/2 or 1/2/2/2
PIHOLE_DNS_1=xx.xx.xx.xx
PIHOLE_DNS_2=xy.xx.xx.xx
PIHOLE_DNS_1=xz.xx.xx.xx
PIHOLE_DNS_2=ax.xx.xx.xx
PIHOLE_DNS_1=127.0.0.1#5335
PIHOLE_DNS_2=1.1.1.1#53