Your problem is coming from the implementation of the FTP server used by your target machine.
Function Module FTP_COMMAND is sending your commands, exactly as you type them, to the FTP server. You only have control over the client side of the FTP transaction.The server's response is entirely controlled by its own software.
It must be possible to set the simplified version of the ls display as the default, but you will need to do it in the remote system.