How to dynamically change color in print designer

[thefox]

We want to use the print designer to print kanban cards for our items.
As these cards often work by using different colors to signal a certain category or storage area, my questions are: how can we define the color in the item doctype and dynamically change the color in the print designer based on the value?

[Yamen_Zakhour]

Using jinja.

<div style=“background-color:{{doc.custom_kanban_color}}”></div>

[thefox]

before adding the variable to the doctype I wanted to try it with a static statement

<div style="background-color:red"></div>

I tried adding this to the custom data section

but unfortunately it doesn’t work