Adding Dictionaries to Annotations

[JustADetailer]

I know that you can use annotation.set_info(title="MyTitle", subject="My Subject") to write those items. I also know that PDF supports adding your own dictionaries. Whenever I try to write a dictionary there I get an error. for instance annotation.set_info(custom_dict=my_dict_obj)

[JustADetailer]

I found my own answer

            line_annot.update()
            doc.xref_set_key(line_annot.xref,"MyDictionary", "[(value1) (Value2)]")