First of all thank you very much for actually bringing BoxPlot function into Qlik Sense directly! I tested it and I like it very much how it works when it comes to its basic functionalities. However, in order for this chart to really become useful for me or our business case is that we need to have an option to have a "reference line" that would compare for example in our case a "client" data vs the aggregated data on the boxplots.
Please, feel free to support this idea guys with any other recommendations or feedback on how this could be implemented and how it could benefit you, so we increase chance of ever seeing this directly in Qlik Sense
I came across your post because I have the same requirement for a customer. In my case they need to show the last value of the series as a symbol on top of the box plot. They already plot this chart using Excel, so they expect to have the same in Qlik Sense.
I'm looking into the picasso.js components to build a custom combo box plot + symbol.