Sorry for the false hope but no
https://github.com/NginxProxyManager/nginx-proxy-manager/issues/707 https://github.com/NginxProxyManager/nginx-proxy-manager/issues/3538 https://github.com/NginxProxyManager/nginx-proxy-manager/issues/4314 https://docs.theme-park.dev/themes/nginx-proxy-manager/
It's still not a thing, but these thread have manual ways of making it happen, and even other colours than dark
But I user dark reader which makes all pages dark
