Creating a Widget on the Dashboard to Track Newsletter Sign-Ups

I’ve created a report that counts how many users have signed up to receive newsletters and how many have not. However, when I create the widget,

I’m not given the option to choose what to track. I would like to know if it is possible to create a widget on the dashboard to easily track this data in real-time.

Additionally, what visualization modes are available, such as table and/or graph?

Specific Needs:
I want to track the number of users who have signed up and those who have not. Ideally, the widget should dynamically update with the latest data.*