Specify DNS servers for LAN DHCP clients

This is for an Orbi RBR850 (not an option in the Model drop down).

I just picked up an RBK852 kit and I'm about to box it up right now after talking with support as there are a LOT of features missing from the firmware.  One of the biggest deal-breakers is that I can't specify specific DNS servers under the DHCP server settings so it can be set for all my DHCP clients.  I'm honestly surprised that this setting is missing as this can be set on most routers (at least every router that I've purchased), and I've used it so that I can use my own DNS server at home (PiHole).  This isn't the only reason that I'm returning this unit, but it's the biggest one for sure.  I have no idea if anyone reads these things, but the support tech that told me this feature didn't exist, told me to post my suggestion here.  But if I knew they were going to add this in a few months I would probably keep the unit, but I'm guessing that there's no way to get an answer about that from the devs.  I thought of turning it into an AP and use my old router as the DHCP/firewall, but I just can't justify $700 for a wireless AP.