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 options, 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 options that are set within these objects override the corresponding options 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.