A constant line label shows information on the constant line. Use the label object to configure all the constant line labels simultaneously. Within this object you can set font properties, a position and text using corresponding fields.
To specify styles for the constant line labels of the argument and value axis separately, use the argumentAxis.constantLineStyle.label or valueAxis.constantLineStyle.label configuration object correspondingly. Note that the properties that are set within these objects override the corresponding properties that are set within the commonAxisSettings.constantLineStyle.label object.
In addition, you can define the appearance of each constant line label individually. For more information, refer to the argumentAxis.constantLines.label or valueAxis.constantLines.label object description.