How to configure Full Reverse Proxy for SFTP Server

I am using the F5 as a reverse proxy for incoming SFTP Requests. I have a virtual server profile defined for SFTP (port 22) and I see the distinct TCP socket connections. However I am not convinced this is operating in full reverse proxy as the SFTP response is still coming from the end server, and not the F5. do you have some documentation on how to configure FULL reverse proxy for SFTP Services .. i.e. that would include inspect of the actualy traffic and not just forwarding.

Thanks!