I’ve got a Lovelace card showing a voltage, which I do calculations to turn into water level. I’d like to create another sensor which takes the raw voltage - 0.5 Vdc -3.9 Vdc, and creates a trendline, which I could overlay onto on top of the overall chart.
I can’t think of a way to do this, and the “trend” binary sensor can tell me when a yes/no trend is used, but it doesn’t draw.