The pgn viewer that is currently being used in this site lack some of the features that the pgn viewer of chess.com has. So why don't we simply use it instead of using our current pgn viewer?
It supports inline comments and annotations. It just requires us to arrange the board and and moves in the Game Editor of chess.com and copy the embed code and paste it here. But I think that the HTML tag for that is currently not supported here. If we could just enable the support for that, we could get a nice pgn viewer for our site.