In the Energy Dashboard, when selecting a bar, also show cost (€) of that bar instead of only kWh amount

When you select a bar in the Energy Dashboard, it shows a popup with the amount of energy used in that hour or day.
Wouldn’t it be nice if it also showed the cost in € in the same popup? I think that would give a better feeling for how much energy you spent.

For example, recently I bought an electric heater. Which (of course) is very noticeable in the graph. But “2kWh” used in the past hour doesn’t give me a good idea of how much this heater is costing me. I have to multiply it by €0,14 in my head to get a feel for it (yes, I’m one of the lucky ones with a long term energy contract with the “old” prices).

What do you guys think?