Does the SFTP client support passing variables, similar to sftp -o "SendEnv MY_VAR" ... ?

[di-ov]

I tried passing the variable via SSH, as suggested in some other issues, like here: #1337

But, actually my SFTP server accepts only "sftp" commands and "ssh" is restricted, so I am trying to express this functionality sftp -o "SendEnv MY_VAR" username@host