Two PiHoles - One Lan, use PiHole1 for most devices, PiHole2 for other devices

Prior to FireWalla taking the place of my router I had PiHole1 acting as my DHCP server, I then used a dnsmasq trick I found on the internet to push a couple mac addresses to PiHole2. I read somewhere around the community that Firewalla uses a form of dnsmasq. Would it support me creating a file somewhere and adding logic like below snippet to support a similar setup as before. The reason for this, is PiHole1 sends traffic to openDNS and has various filters in place. PiHole2 doesn't use openDns servers. 

#configurationExample... /etc/dnsmasq.d/DNS_override.conf (user created file)
dhcp-option=tag:bypassopendns,option:dns-server,192.168.1.3
dhcp-host=30:xx:xx:xx:xx,set:bypassopendns,DeskTopName