How to make the Contact Map Widget work at Mautic Dashboard?

Your software
My Mautic version is: v2.15.2
My PHP version is: 7.2.16

Your problem
My problem is: I am only using the email automation part of Mautic, so I have no landing pages, no forms, no website visitors. I have 100.000+ users in my database from multiple countries with location data (eg. country, city, address etc.). The “Contact Map” widget on the Dashboard shows nothing. I could not find any documentation related to this widget, so my hypothesis is that it shows people who visit a website served by my Mautic instance. So my questions is if there a way to display the users in the database on the map?