Feature Request: show values (of fi power) in history section

When selecting the history section, you can select the area, device and entity for a defined time period.

The big disadvantage is that when you select for instance the power graph of an entity, you cannot see the total amount of power for that selected period. This is really a pity.
Maybe there are other ways to get this total, I haven’t found it.

Remarks are appreciated!
Thanks, Jean-Paul