You can do this for host records.
But I don't think there is an option for reverse dns lookups.
You can only resolve names to ip addresses with SRX entries.
You cannot reverse dns entries of ip addresses to a name.
I'm not sure I follow the question so apologies if this is not a matching answer. These srx records only work when the clients are using the srx as their dns server. They create srx local answers for the specific requests on the srx. Other dns requests are forwarded normally.
Caching of answers will follow all the normal client side parameters.