Yeah, I saw the title and author lines in the asciidoc header and got confused because there's also a field. Maybe generally have a metadata section at the top of the preview, with the asciidoc header info pulled, for them to edit.

And then we have it prepared for generating ePUB format. We just have to map to the require ePUB fields.
https://docs.asciidoctor.org/epub3-converter/latest/