Scale a GameObject in world space.

I am trying to achieve this:



This is a non-axis-aligned cube being scaled in world space in blender alongside the Z axis (Y in Unity). I want to achieve the same in Unity. I tried to find formulas for this but had no luck, I know that I can parent my object to another GameObject and scale the parent, but once I unparent my original GameObject the scale resets back and I need to scale the original GameObject. Any advise would be much appreciated.