Custom Line On Gantt Diagram

Hi Everybody!

Is it possible to show a custom line on Gantt Diagram showing the difference between Finish Date and BL Finish Date?

In Line Filter I only can compare one of them to specific numeric value and I need to compare them against each other and paint the difference in red color.

For Example my current situation

current_situation.jpg

And what I want to show

what_i_want.jpg

I only able to draw all line in red, but I want only part of it being red.

Will be glad to hear any suggestion how to do it.