Filter some traffic to be handled by different DNS for "SmartDNS" geolocation purposes - how?

We’re using the zero trust DNS services and have a new requirement. Need some traffic - let’s say bbc - co - uk - to be pushed down a SmartDNS Proxy route instead of being served by cloudflare. Is there a way to do that with the zero trust settings? (Have searched/can’t find) Prior to cloudflare we used AdGuard and you could do that in the Upstream DNS settings by defining the domain and the DNS server to use.
Any ways to solve this requirement w/cloudflare DNS? fwiw we aren’t using the WARP clients and don’t intend to if that is the ‘solution’

Much thanks in advance.