Thank you for noting about your code, just what i wanted!
I missed when CC got ability to draw bars and couldn't even imagine my idea above is fully implementable already!
That's what i LOVE about XY - there is always some way to get what you want the way you want it.
I'm really glad with results, the only thing i miss is ability to sort this column not by percentage of bar fill, but by actual size. But oh well, guess that's already too much for single column.