OptionaltitleTitle for the size legend.
OptionaltitlePadding between title and legend content in pixels.
OptionalvaluesCustom values to display in the size legend. If null, auto-generates [min, mid, max].
OptionallabelCustom formatter function for legend labels.
OptionalnoWhether to show a "no data" item.
OptionalnoText label for "no data" item.
Configuration for size legend in bar chart maps.