How to add/fix a threshold value in the Line chart of Openremote

Hi , I wanted to indicate a threshold value in a Line Chart. For eg. If The threshold value of Power forecast of a solar panel is 350 Kw, after that the value goes on decresing. So, how to show this in Line chart.At least like 350 Kw as a fixed dot of threshold.

I don’t know if that’s possible, maybe create an attribute fixed at 350 and use it as a threshold in the chart?