Background of presentation components

Hello,

I would have thought to change the background of a presentation component bric (for instance laptop) to dynamically show some data of my home automation system.

So I thought to add an HTML script bric as a background of this presentation component in order to run a PHP script but I have not been able.

I just found a way to change the background image.

Is there a way that I missed? Please advise.
Thanks,
dan