Set HA Darkmode Theme from Automation

I like the dark mode theme and want to use it in an automation. SO I know how to set a theme by automation but I have no idea what the name of the dark mode theme ist. The light version is default, but what is the name for dark?

This should be in #configuration:blueprints. Anyway, I don’t think this is possible, unless you set your OS to dark mode, or maybe use browser_mod.