A blurry background and sharp foreground is only one example of depth of field. What about where the camera focus is mid way between fore and background?

Unfortunately I don't know of any cover all solution that works for this.

My depth of field hack jobs consist of duplicating, layering, and blending of various degrees of Gaussian blur...not ideal, but it works for me.

If we can hit that bullseye, the rest of the dominos will fall like a house of cards...checkmate!