Hi @Puuskis ,
I did a test for you .
1\ This is my list 'LIST124'.

2\ Add a column chart and set its Items property to:
AddColumns(GroupBy(AddColumns(LIST124,"TeamName2",TeamName.Value),"TeamName2","AfterGroup"),"Number",Sum(ThisRecord.AfterGroup,NumberOfCalls))

3\ The result is as follows:

Best Regards,
Wearsky
If my post helps, then please consider Accept it as the solution to help others. Thanks.