DevExpress Blazor Chart components allow you to display and configure annotations (comments about chart content). DevExpress Chart components support text and image annotations. These annotations can be anchored to chart elements or remain unanchored (positioned with X and Y coordinates).

To create an annotation, you must:

1. Add an appropriate annotation object to chart markup (DxChartAnnotation for DxChart, DxPieChartAnnotation for DxPieChart).
2. Specify annotation type and location.
3. Optional. Customize annotation size and appearance, and configure tooltips.

Note the customized annotations (with tooltips) used in this demo: four text annotations anchored to series points and one draggable image annotation positioned with pixel coordinates.