The history graph is a very neat feature as is, but maybe a bit lacking in terms of infos at a glance.
It would be nice if below the graph, it would show the min/max/avg values for the selected timesüan
You could use the statistics graph. It reports max, min and mean for 5 minute intervals.
Your sensor must have a state_class: measurement.
Indeed would be nice to have numbers for min/max from past 24hours or a different time frame.
I like to have my sensor the min and max value for every day as a number. Or for the last 24hours for example. To avoid to look up in a graph the value