display – Can mac os support greater than 2x retina (for a small 4k screen)?

I’m interested in a 4k portable monitor which is 14″ in size.

I believe it is mainly intended for use with iOS/Android, however it does say supports mac/win.

The concern I have is that even at the familiar maximum 2x scaling, which we call retina resolution, 14″ at “looks like” 1920×1080 will result in very small ui.
To compound the problem in this case, this display is touch, too; which is likely to make finger accuracy an issue.

Does or can mac os support greater than 2x retina?
How are the supported resolutions for a display defined?
Is this something apple does, or does the manufacturer do it; can a user adjust it without going too low level?