update-policy

hi,
i wondered if there was any way to set an update policy, e.g.

zone "test.com" IN {
        type master;
        file "/etc/zpanel/configs/bind/zones/test.com.txt";
        allow-transfer { any; };
        update-policy {
                grant username.test.com. name a.test.com. A TXT;
                grant username.test.com. name b.test.com. A TXT;
                grant username.test.com. name c.test.com. A TXT;
        };
};