solved: solved it was integers for type.
I wish that count pages plugin worked for me in calibre.
like in the customize count pages, nothing actually shows up in the drop button for the custom columns.
readability options doesn't work either.
I keep thinking that count pages plugin doesn't work for macOS Ventura 13.4 or calibre 6.21.
maybe there is something I am not adding to the customize count pages plugin.