I did this

There is plenty of topics about Unicode issues in Windows. And here is another one.
I try to use Windows Server 2016 and curl with so called Unicode support feature.
So I have

Test string looks like

curl -v --data спасти http://httpbin.org/post

And this is the result

I expected the following

So what should I do in order to force this feature to work?

curl/libcurl version

8.1.1

operating system

Windows Server 2016 Standardx64