On top of a per-origin override, you can now set a Chrome-wide preference to have your OS in Dark Mode but all sites in Light Mode (or vice versa).
Chrome Dark Mode Toggle v1.1
Tag Archives: web preferences api
What if you had real control over Light Mode / Dark Mode on a per-site basis?
Dark Mode Toggle Buttons should be a browser feature. Thanks to the Web Preferences API, that might become a reality someday.