[webtool feature idea] Grouping midpoint indicator graphs by year/car type/

[floriandierickx]

An idea while exploring the graphs of the midpoint indicators in the webtool: it might be handy to be able to (maybe hiërarchically?) group the presented graph by either year, car size or car type, for easier comparison over time for a specific group/year/car size.

Is it possible to go through / contribute to the webtool graphs? I could not find (yet) a reference in the domentation or in this repository, but if it is possible, I might be interested to look at it. I have some experience with R, Javascript, Dash/Plotly and Highcharts, if any of those (or something similar) has been used.

Thanks again for your work!