Just check fr this answer may help you,

Take a closer look at what you are wanting to do on specific section.
create a custom selection field that stored the HTML codes of the colors as the Value.

Then used this syntax for changing the style attribute:

margin-bottom: 10px; border-width: 5px; border-color: {{record.x_order_type.raw_value or 'white'}};

Note that you don't actually need the t-attf- prefix when you are not using substitution to compute attributes on-the-fly - see

So honestly i thought you where just a bit... slow untill i tried doing that myself :D

so i filed it as a issue on github. 

https://github.com/odoo/odoo/issues/95710

This is exactly the same question as i have. Did you find the answer yet?