Stacked waterfall graph

[HymaiaJP]

Hey, 

I need to implement a slightly special looking waterfall graph in a dashboard. This has previously been implemented in excel as a POC where we used a stacked bar graph to get it to work (using invisible bars like in this example https://superuser.com/questions/1711738/stacked-waterfall-chart-with-positive-and-negative-values-in...). I dont know where to start, am i likely to need an addon to do this?

Essentially we start with a normal waterfall, of the Job difference v last year by channel. Then i split out these differences to show the effect of our change in volume leads and conversion rate on the jobs.