Adding visualization for aw-watcher-input

Hi!

I'm interested in adding a new visualization for continuous data with a y-value (e.g. a keystroke frequency histogram) to the UI. My first idea is to try a [joy plot](https://eagereyes.org/blog/2017/joy-plots) with values from different watchers. Is there any info/docs I should know/read before I dive in?

Thanks!