Kalman filter to time chart

Hi, I would like to apply a Kalman filter to time series or some other statistical that would smooth the time series charts. Also if possible, I would like to remain with the standard visual (line chart). How can I do that? My data set looks as follows :

The data has been split up by entering a value for "Legend", which represent the different classifications for the data rows. 

Maybe someone from Microsoft support or other professionals might indicate how I might modify the custom visual for line charts.  I thought about adding a custom python script for creating a modified time series in the visual. Or is there a way using the DAX-language?