Hi,
I am creating them programmatically, roughly like this:
const field = new Annotations.Forms.Field(fieldItem.Id, {
value: fieldItem.Value // some value
});
const annot = new Annotations.DatePickerWidgetAnnotation(field);
// ... apply page/width/height/x/y here ...
annotManager.addAnnotation(annot);
annotManager.redrawAnnotation(annot);
Cheers, Luke.