I think you'd have to go back to 1.35 - however that doesn't support the http remote!
I had to take that out for lots of good reasons so I don't think I would put it back in the sync command. However I could envision a different command.
Thinking of that, I think you could use rclone copyto for this for copying one at a time.
If you make an http remote then try rclone copyto httpsource:file drive:file and that should copy a single file with no directory traversing. You could script that easily enough.