The chapter title could be restored fairly easily, but the percentage would be a lot harder.
The database stores the link to the chapter and when the annotation list is displayed, this is used to get the chapter name from elsewhere in the database. This could be fixed with a little fiddling.
The percent into the book is store as a number. When this gets set to zero, it would have to be recalculated by processing the book. There is probably a method in calibre to do it, but, I have never looked into it.
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