Tunneling through proxy & SSH server

A SOCKS5 proxy is between my source and target servers. The source server can be accessed only from my local server. I tried connecting through proxy option and SSH tunneling option in Winscp but the problem is as below: The SOCKS5 proxy is used only for my source server(tunneled one) instead, I would like to use it for my target server. Please let me know how I can achieve this. Flow: Local system -> Source server -> SOCKS5 proxy -> Target server