No.

This request is being tracked already:
https://winscp.net/tracker/1738
You can vote for it there.

Hi,
I would like to confirm that, is it possible to upload files (Veeva FTP) by giving bytearray as in input source and by using WinSCP (C# libraries, put command)?
Also apart from this, does the put command support Azure blob container as an input source directly?

Thanks in advance.