How do you add the SITE TRIM 0 parameter to WinSCP?

We are moving from SecureFX to WinSCP, and one of our users is asking, how do you specify SITE TRIM 0 in WinSCP? This is one of the parameters that they add to SecureFX on a day-to-day basis.

I have attached a short document showing screen shots of SecureFX. Thank you.

For an ad-hoc execution, you can use Commands > Open Terminal or command-line box.
See https://winscp.net/eng/docs/remote_command

To execute the command automatically whenever a session starts, use Post login commands:
https://winscp.net/eng/docs/ui_login_ftp

Thank you for your reply, Martin.