How to add a total column in column chart?

Question

my current datasource is SSAS, the data set format likes:

Name   Count     Month
A          3             1
A          6             2
B          1             1
B          2             2

The Name row is dynamic.

The report x-axis is Month, y-axis is Count, Series field is Name, the chart now shows each person's count/month, I want to add a total count column (A count + B Count) for each month, likes:

Name   Count     Month
A          3             1
A          6             2
B          1             1
B          2             2
Total    4             1
Total    8             2

How should I do? Thanks!