I wish ebook-viewer added highlight annotation capability, I can use PDF viewers to highlight texts but not ebook-viewer, so I had to convert all of epub etc to

I wish ebook-viewer added highlight annotation capability, I can use PDF viewers to highlight texts but not ebook-viewer, so I had to convert all of epub etc to PDF under calibre. for technical books annotation is essential for me, it's my notes so I do not need re-read the book from start to end each time.