I am looking to be able to do the same thing. I tried all different things and did not work. Let me know if you find a way to do it.
Also, I was looking for a way to add a Bell Shaped curve indicating the normal distribution. I created a discussion, so let's see if it is possible, or if they will add in the next release.
Thanks a lot, Rob!
I've come across this thread and it's a viable workaround. However, I'd need several reference lines (2 or more) and the customers requirments tend more toward a reference line than a colored bar.
Is there a way to suggest vertical ref lines as a feature request for the histogram chart type?