If Zenity is not featureful enough for whatever you're trying to do, there's always Gtk-server (https://www.gtk-server.org/intro.html https://www.gtk-server.org

If Zenity is not featureful enough for whatever you're trying to do, there's always Gtk-server (https://www.gtk-server.org/intro.html https://www.gtk-server.org/intro.html) as well.