Install Adwaita shell theme on Ubuntu 20.04?

I have gnome-session package installed as I am using stock GNOME on 20.04. It has been changed to gnome-shell-theme.gresource. Located in /usr/share/gnome-shell.

I managed to extract gresource by running

cd /usr/share/gnome-shell

gresource extract gnome-shell-theme.gresource /org/gnome/shell/theme/gnome-shell.css > ~/gnome-shell.css

sudo mkdir -p /usr/share/themes/new-theme/gnome-shell

sudo cp ~/gnome-shell.css /usr/share/themes/new-theme/gnome-shell

Make sure users themes extension is enabled. Now it should appear in GNOME Tweaks.