Custom statistcs chart - Include TeamCity agent Name series

Hi,

I am creating a custom build statistics chart on TeamCity. I have a build step which creates a service message like this
##teamcity[buildStatisticValue key='<valueTypeKey>' value='<value>']

I am able to successfully plot the chart based on the values from the build. But I would like to plot the values for each TeamCity agent with different color similar to the built-in statistics.

Could someone please guide me on how to achieve this?

Thanks,

Paul