I think you gave the answer already. I would say the easiest implementation would be to have two charts and use conditional visibility.
However, to maybe make it more future proof and flexible, I would still recommend taking the time to recreate it using Anychart.
Thanks Micha, I am very new to Mendix, so I wasn't confident that I was not missing a way to do it without 2 plots. Yes, definitely I am also looking into building it with AnyChart.