send client ip to upstread dns adguard

### Prerequisites

- [X] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions) and found no answer

- [X] I have searched other issues and found no duplicates

- [X] I want to request a feature or enhancement and not ask a question

### The problem

I use an upstream DNS for my clients based on their CIDR ( it's a geo load balancing DNS server ), now I want to be able to cache the client ip and server that has been told to client for 24 hour and as I only see adguard home IP address its impossible to do such, how can I do it ?

actually I want to achieve sticky sessions or something like that via this trick

flow :

Client => adguard home => upstream DNS

Is there any solution for me ?

### Proposed solution

if there would be an option to send client ip to upstream dns it would be great or I don't know something like that

### Alternatives considered and additional information

replace the adguard with my upstream DNS and develop what ever I need from adguard on that DNS system