tighter integration of "keditbookmarks"

[z]

> https://mail.kde.org/pipermail/okular-devel/2021-August/040423.html
> https://bugs.kde.org/show_bug.cgi?id=427465

it would take me not much time to make a little python GUI allowing for 
portable bookmarks under /home/okular or such.

I wonder whether folks see that this would enhance Okular so much.

Serious document workers absolutely need stable cross-references / 
bookmarks in Okular.

Without workable "bookmarks" / XREF , the professionals will not take 
Okular seriously.