Aggregation of AWS billing in Grafana dashboard


I am creating a dashboard for aws billing, so used the cloudwatch plugin. Able to create the basic dashboard. But want the continuation in billing graph let me explain it.

AWS generates the bills on monthly basis… Dec - $100 Jan - $120, Feb $140. When plotting the graph, whenever the month changes sudden drop comes in graph, which is because aws billing counter goes to zero for new month as shown below


Is there anyway, we can plot the graph where there is not drop? In other words billing graph shows continuity.