Pihole '04-bypass.conf' backup DNS

[udop1]

Hey,
I'm successfully using https://github.com/deathbybandaid/piadvanced/blob/master/piholetweaks/dnsmasqtweaks/04-bypass.conf with my Pihole, however, I am unable to add a secondary DNS (This, of course, may just be my lack of knowledge).
With the DNS, in this case, I am using google's one, you should add both '8.8.8.8' and '8.8.4.4' to a device but dhcp-option=tag:googledns1,6,8.8.8.8 only adds '8.8.8.8' to the device.
Is there any way I can add the '8.8.4.4' to it as well?

I've tried things such as dhcp-option=tag:googledns1,6,8.8.8.8,8.8.4.4 and
dhcp-host=MACADDRESSHERE,set:googledns1,googledns2 where 'googledns2' would have '8.8.4.4', but I've had no success.

Is there any way I can achieve this?

Hopefully this all made sense,
Thanks.