Overwrite SOA-Records in RPZ-Responses?

[Tom]

Hi list,

 From "https://kb.isc.org/getAttach/21/AA-00512/rpz.txt", Chapter 3 - 
Subscriber Behavior:

...
...
If a policy trigger results in a modified answer, then that modified 
answer will include in its "authority" section the SOA RR of the DNS RPZ 
whose policy was used to generate the modified answer. This SOA RR will 
tell both the fully qualified name of the DNS RPZ and the serial number 
of the policy data which was connected to the DNS control plane at the 
time the answer was modified.
...
....




Is there a way to overwrite the SOA-Record in a RPZ-Response 
"on-the-fly", whose zone is configured as "slave"? Because we use 
configured some third-party-rpz-zones, the soa-record is predefined...

Thank you.
Kind regards,
Tom