'Is it possible to set the color on a Card header for a Google Workspace Add On?

I'd like to update the color of the Card header of a Google Workspace Add On I'm developing. Is this possible?

Google has a sample project here: https://developers.google.com/apps-script/add-ons/cats-quickstart#drive.gs. In this screenshot from the sample project page, the Card header is red:

When I deploy the code, the header is gray and I don't see a way to update Card header color in the docs: https://developers.google.com/apps-script/reference/card-service/card-header

Is there a way to change the color of the Card header or am I out of luck?

Other Google Workplace Add-Ons I've installed have had different Card header colors. Zoom is blue and GoTo is black.

Solution 1:^[1]

Looks like this isn't configurable dynamically but set at the project manifest level via LayoutProperties.

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Solution	Source
Solution 1	Eugene Kim