Since dimension names sometimes tend to get too long for the available space for both labels and legends in diagrams it would be very useful to add a multi line option to be able to fit the full dimension name. The user can hover over the labels and legends to see the full name but if a user takes screen shots for example, the ellipsis function of the lables and legends do not fulfill the needs. Therefore, it would be very useful to add a multi-line option in the properties pane, both for labels and legends in all native diagrams.
Further, at the moment, multi lines are presented automatically in legends for bar diagrams but not for line charts which feels inconsistant. It is not optional so it seems like there are different functionality in the legends of the diagrams.