It doesn’t make much sense to display the battery percentage here because it’s a completely different kind of metric. The data here represents the change (or profile in case of graphs) during the current day (month, year or selected interval).
I’d argue knowing how much battery capacity you have remaining is a key metric one would be interested in when viewing information about their home energy usage - aka the “energy” dashboard.
I know how much energy I’ve produced and consumed, I can view a forecast of how solar is remaining to be produced today and tomorrow, but I can’t know how much I’ve got stored available for use?
We don’t leave the speedometer off the dashboard because it’s a different kind of metric to the fuel gauge. They can co-exist
After a day/month/period, you have 58% battery remaining. Still a useful figure to know if, for example, you’re off-grid, in a caravan, or simply watching your energy consumption. Could even be overlaid on the production graph, with a dotted “forecast” in a different color/style to indicate the predicted discharge rate, though now we’re talking feature creep
Just use Power Flow Card Plus, that’s for “now” metrics.
Energy dashboard doesn’t even show values for current hour, it really does not make sense here and not in terms of a type of values but in a time manner.