You could get the widget settings the same way the admin page does. Make a list of widget areas, then fetch the data for each widget. Then, filter the returned object for the specific widget you're looking for.
I followed the tutorial online on how to create NodeBB plugins. After following all the steps, the plugin is not visible under installed plugins in ACP. I tried to restart but there's no changes.
Can you see any errors in the log when starting up?