How to bridge a remote ftp server using connect proxy ( kind: connect-proxy) and also access it?

I registered an ftp server as service in consul and a connect proxy (in a separate service definition ) for the same.

No I need to access the ftp server via proxy ? Is it possible to do that ?
is there any way to register any other service other than a we service. I noticed on consul docs, an example for DB, but not sure how to configure that.