Widget Graph that Shows User Groups

I know there's a thread about something similar to this, but it's pretty old now. I want a graph on my dashboard that shows all the user's tasks amounts, but groups those users by their team. I have them categorised by user groups, and if I have to manually create a different subsection then that's okay - but I tried creating a custom field of people and the graph only allows me to bring in one instead of the 6 teams I need.

It can be done in the widgets through the Team filter, but that's only focusing on time management - I need it to show amount of tasks.