Yes, please!
I have been thinking about this for a while and would really love to see this happening!
Start easy, maybe add a column on the current energy dashboard on the right with the costs that occurred for the device in the chosen timeframe?
It would be so, so encouraging to see that something that consumed X kWh actually was cheaper than something else that ran another time of the day but consumed X-y kWh !
e.g. I have my boiler to run every night (when it’s cheapest) and electric floor heating only on when it’s cheap energy.
I realise that this may be a complicated calculation if you have three main channels coming in with different prices / own production on some channels, not others. - But this might be easier than I think?