There are 2 repositories under jpdfbookmarks topic.
jpdfbookmarks - fix JPdfBookmarks GUI mode open a pdf have bookmarks include CJK (Chinese , Japanese , Korean ) characters will show like tofu char (□) , add native installer ( msi , deb, rpm)
JPdfBookmarks build native installer
Shell script to change JPdfBookmarks from ANT to Maven
This is a modified version of https://github.com/asciidoctor/asciidoctor-maven-examples/tree/main/asciidoctor-pdf-cjk-example