Scale Text to Fit

How can we fit a Text to a given maximum Width & Height?
I would like my text to auto-fit a given boundary box. Either by scaling down the whole Text Object or just the Font Size.

Is this even possible?

I can find methods to reposition Text objects based on the width and height of another Text (via bones connected to the Text's size), but I cannot seem to make the conversion from using the Bone's position to use for calculating the Scale of another Text object.
Is it possible to somehow connect Bones to a variable Text, so it can be scaled like any graphic?