valueDescriptionFormat property
Format to use for describing the values of data points
to assistive technology - including screen readers.
The point context is available as {point}.
Other available context variables include {index}, {value}, and {xDescription}.
Additionally, the series name, annotation info, and
description added in point.accessibility.description
is added by default if relevant. To override this, use the
accessibility.point.descriptionFormatter
option.
API Docs: https://api.highcharts.com/highcharts/accessibility.point.valueDescriptionFormat
Implementation
String? valueDescriptionFormat;