how to overlay text on a viewport?

may i ask if there is a way to overlay text on a viewport, e.g perspective or parallel, that is independent of the change of the view within that viewport?

The remote control panel can be used to show some of the controlling variables or outcome variables. But it still covers quite a lot of the viewport space.

The following is what I used to do in the Houdini software in which text object and other geometry can be "locked" with a camera so that they are always displayed on the same position on a viewport on top of whatever is shown in that viewport:

Thanks.