Panel Group with background color

Hello there.

I would like to know if it is possible, even if it takes custom plugins, to make a panel like the image below.


Currently, it is like this:

How can i add a white background to the panels like in the image above?

I installed a plugin called HTML Graphics, and i think that it is the solution.
But i didnt understand how it works, tho i feel it will work as i desire, since i was able to replicate the exact design i did on Figma.

Now i’m just mapping the values to each green square.