How to install and use Adwaita-dark theme?

Sorry to ask a support question here.

Is it possible to use a dark theme like Adwaita-dark? The idea is of course to have a GTK+3 dark theme when macOS is also using a dark theme.

I found "Changing GTK themes in OSx" but it is from 2008 and for GTK+2. I guess gtk-theme-switch will not work for GTK+3.