100% Stacked Bar Chart

Hi team,
Is there a way to create a stacked bar chart that goes to 100%; i.e. showing the % split of records instead of simply the absolute count of records.

I have this chart to roughly measure conversion rate from various sources;

Screenshot 2021-05-03 112835

But it would be even better if each bar extended to 100% and instead showed the percentage of records from each source that either booked or were lost.

Screenshot 2021-05-03 112835b

Is it possible to create something like this; either by manipulating the data via formula, or with a chart/app option that I’m missing?

Yes - play with Vega-Lite.