Well, I found a way around :) !
(another way around, I start to have lot’s of ways around to do some simple things !)
Check https://jsfiddle.net/mgck92pw/
– You’ll need to use another axis and hide it here “axisX2”.
– You’ll also need another ‘data’ item, with just one value. I’ve chosen here “rangeArea” to get a square element in my legend.
IF you could show me a way to interact with the legend in another way, that’ll be great! thanks