The wj-flex-chart-data-point directive must be contained in a wijmo.angular.chart.annotation.WjFlexChartAnnotation directive. The property of the parent directive's object where wj-flex-data-point should assign a value is specified in the wj-property attribute.
The directive supports the following attributes:
@The name of the parent directive object's property where the DataPoint will be assigned.
@x coordinate, can be a numeric or date value.
@y coordinate, can be a numeric or date value.