Show Threshold in Diagram

[Dipl-Inge]

Hi,

I'd like to have a threshold in my diagram. I have an EV Charger where I can set a threshold (e.g. 27 Ct/kWh). If the priced is below the threshold my car starts charging. In the frontend of my EV Charger (OpenWB) it look like this:

I have a horizontal line marking the threshold and only bars below this threshold are colored, periods where the price is above the threshold are grey.

I'd love to combine it with your stunning diagrams you already support. What I currently have is the following:

So I want my diagram to look as it it, except for periods where the price is above threshold (Should be colored grey) + a horizontal line marking the threshold

I already try it for 2 days, but I cant get it work. The threshold in my case is from entity number.openwb_chargepoint_3_max_preis_strompreisbasiertes_laden

Thanks in advance for your help!