Total device (km) on Edge series (i.e. 520)

Among the fields can not be displayed on a Edge 520 the "Total device" (km) which can be accessed in the history (Totals).
It would be helpful so you can view it as a field in 520
Thank's

P.S.:
"Total device" is different from the "odometer" that indicates the (totals) km of each profile.