Since I ran out of characters in my toot above, I'm adding here the links to @lbaudin's two massive merge requests and the issues they solved:
* My feature request for ink annotation (featuring a #PHDcomics example of a practical usecase 😏): https://gitlab.gnome.org/GNOME/papers/-/issues/236
* My feature request for freestanding text annotations (that get printed out etc.): https://gitlab.gnome.org/GNOME/papers/-/issues/129
* The work done in the underlying library: https://gitlab.freedesktop.org/poppler/poppler/-/merge_requests/1735
* The work done in #GNOME Papers: https://gitlab.gnome.org/GNOME/papers/-/merge_requests/298









