How to get static prop screen size percentage in a material?

So Unreal uses the screen size percentage method for calculating LODs, and I’m wondering if there is a way to duplicate this in the material editor so I can do some fancy stuff to make the transition between LODs smoother (I like the dithering/stippling but in some cases I wan’t to do more).

Is there some way to get the static props’ object bounds and transform that into screen space? Then I’m guessing I’d just need to divide that by the screen resolution for which there seems to be a couple of nodes for already.