It has near zero customizability. What about:
- disabling the legend
- controlling names in legend for each statistic type (e.g. min, max, mean)
- being able to show on legend only entity names without statistics type - would be great for more statistics
- changing names of entities in card from UI (and fixing the yaml editing part)
- controlling colors for entities, at least the non-dimmed ones
- setting static scale
- showing full period also when statistics are missing for some of it