All the icons for adding charts to Creator pages show two coloured series of data.  But I can't see how to create a chart with two separate series.  My choice is between a Web chart, which only seems to show one series, and a Stacked Web, which takes two series but adds them together.

My users score themselves from 1-10 against 12 skills before and after doing a project.  I want to layer the before and after scores so that the user can compare their progress visually, without adding anything together (sample image attached).  Has anyone done anything like this please - either with native Creator or an add-in?  I can't embed something from Analytics as I need it to update in real-time.