Grouping sensors in history charts

At the moment all sensors’ charts are grouped by unit of measurement. E.g. for all humidity sensors from Netamo are presented on a sigle chart in history view, which makes perfect sens. BUT recently I created custom sensor (for cloud coverage compensated light level) that I made to also have unit of measurement in %… and now this sensor shows in the same group as humidity sensors, which make no sense…
Is there any way for logical grouping of sensors in history charts other than by unit of measurement?