Can someone kindly provide how to use proxy setup for SFTP?

Hello,
Can someone kindly provide how to use proxy setup for SFTP using .NET assembly?

I am looking for similar to /rawsettings option in the .NET library.

( /rawsettings ProxyMethod=3 ProxyHost=proxy ProxyPort=8080 )

Thanks in advance!

SessionOptions.AddRawSettings
https://winscp.net/eng/docs/library_sessionoptions_addrawsettings