Using SSH CA with WinSCP

Is it possible using the WinSCP command line tool, to use a certificate (SSH CA) to authenticate with a remote server over SSH?

If so what is the syntax?

Usually with scp on linux (where the cert is in current path) it's

Are you referring to OpenSSH certificates? WinSCP does not support them:
https://winscp.net/tracker/1873

Many thanks for the info.