Adding Total Column in Graph?

Hi,

I want to use LebreNMS to see my total amount of data that is going through the router. I have created a Port Bits graph and that looks good. I only miss a Total Column in that graph in the legend. How can I add a Total Column in the graph?

This is how it looks like now:

https://docs.librenms.org/Extensions/Billing-Module/

Thanks. It was already configured. I have created a bill bits graph. Hope this works. I had used Cacti before and that’s where I know it from.