PowerDNS: spoof NXDOMAIN response from "forward-zones" server and forward it

I faced an issue trying to setup PowerDNS for my local network. I have a domain example.com managed by Cloudflare.

For instance I have A record on Cloudflare like server.example.com pointing to 1.1.1.1 but my local clients should resolve server.example.com to 10.10.10.1 and it's not a problem by using forward-zones="example.com=127.0.0.1:54"; in recursor config, but I have another record like mail.example.com pointing to 2.2.2.2, that server is outside of my local network and I have to copy A record from Cloudflare to my local PowerDNS by hands otherwise local client gets NXDOMAIN.

Looks like I need to spoof NXDOMAIN response from local PowerDNS and query forwarder. Is it possible?

EDIT: I started with LUA script and is able to catch NXDOMAIN response. But I can't forward it.

function nxdomain(dq)
    pdnslog("Intercepting NXDOMAIN for: "..dq.qname:toString())
    if dq.qtype == pdns.A
    then
        dq.rcode=0 -- make it a normal answer
        dq:addAnswer(pdns.A, "10.10.10.10")
        return true
    end
    return false
end