How to exclude a folder from iCloud synching without renaming it?

I know that I could rename a folder by adding a ".nosync" suffix to exclude it from iCloud synching.

I could also make the folder hidden with prefixing a dot to the name and then make a symlink to simulate pretend the original folder is still there.

Example:

$ mv MyFolder .MyFolder.nosync
$ ln -s .MyFolder.nosync MyFolder

However it would be nicer not to have to rename it in order to mark it as "nosync". Is there any other way? Maybe putting a file inside the folder? Or set a flag somewhere else in macOS?

Is there any official documentation about iCloud synching configuration?