I was looking for this answer on the web for some time. But apparently my search phrases were wrong or it is really that hard. But I doubt it.
Imagine, I have any 3
You can do that with a UI Text game object and the 3D Object.
The steps are as follows:
Create a UI Text object.
Drag the Canvas to become a child of the cube.
Set the Canvas to World Space render mode, remove the Canvas Scaler component and set Width = Height = 1 and all Pos = 0.