I’m writing a plugin called PDF++, which adds a “pseudo-annotation” feature to the builtin PDF viewer.
The idea is, when you insert a link to a selection in a PDF (e.g. [[file.pdf#page=1&selection=0,1,2,3]]), the referenced text is displayed with highlights in the PDF viewer.
However, this plugin relies on many private APIs of Obsidian since the public API does not allow us to modify how the PDF viewer behaves.
So there is a relatively high risk that this plugin may break when Obsidian is updated.
For this reason, I hope this plugin’s functionalities will be natively supported by Obsidian itself so that we won’t need this plugin anymore.