Perspective XY chart coloured background

Hi everyone,

i tried to create a colored background in a XY chart to easily check if my curve is inside my tolerances. I want to display a curve with the values of the last 8 hours.
For that, I created a dataset in the ‘example’ datasource with tolerances values along with a ‘now’ timestamp :
Capture d’écran 2021-07-02 162019
Displayed as bars with a very large width, the display works :

When I try to add another datasource with a binding to my curve dataset, the curve is not displayed, but when I remove my ‘background’ dataset, then the curve is displayed.

Should I use another type of chart ? Isn’t that ‘Control card’ style something common that could be a property ?

Thank you in advance for your help.