public void CreateAnnotationTest()
{
Annotation annotation = new Annotation("500");
annotation.AddCreator("Stefan Weber");
annotation.AddGenerator("My super duper app");
annotation.AddBodyElement("Ich bin ein Text", Purpose.Commenting);
annotation.AddPdfTextMarkupTarget("83743", PdfAnnotationType.Highlight, null, null, "Ich bin der Text");
var options = new JsonSerializerOptions();
options.PropertyNamingPolicy = JsonNamingPolicy.CamelCase;
options.DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull;
var result = JsonSerializer.Serialize(annotation, options);
}