Custom annotation metadata based on element attribute

[probavee]

Hi, thank you for this library ! Is there a way to add whatever we want to the metadata in annotations ? For instance i'd like to annotate HTML like so:

[(0, 10, {"name":"a", "href":"http://example.com"}),
(10, 11, {"name":"img", "alt":"my alternative text"}), ... ]

However, I haven’t yet found a straightforward way to achieve this with the current functionality of the library. Do you have any insights or suggestions on this?

[caineblood]

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