If you want to run some curl on icon click from Ubuntu 22 panel, then you need to create file in ~/.local/share/applications:

[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
Terminal=false
Exec=curl http://x.x.x.x:yyyy/action
Name=Gateway
Icon=dialog-information

Then after few seconds, press special key (aka Windows key) and type your “application” name. You can grab and paste it onto application panel to be shown as a shortcut.