Expanded class hierarchy of YaxisTitle in Charts 8
- class \Drupal\charts_highcharts\Settings\Highcharts\ChartTitle implements \Drupal\charts_highcharts\Settings\Highcharts\JsonSerializable
- class \Drupal\charts_highcharts\Settings\Highcharts\YaxisTitle implements \Drupal\charts_highcharts\Settings\Highcharts\JsonSerializable