Set covers as chapter bookmarks

0-front/cover.tex

@@ -1,2 +1,2 @@
-\pdfbookmark[part]{Front Matter}{frontmatter}
+\pdfbookmark[chapter]{Front Cover}{frontcover}
 \includepdf[pages={1}]{../covers.pdf}

main.tex

@@ -62,6 +62,7 @@
 \importchapter{5-back}{acronyms}
 \importchapter{5-back}{figures}
 \importchapter{5-back}{tables}
+\bookmarksetup{startatroot}% End the parts in TOC to set chapters at the root level
 \import{5-back}{backcover}
 
 \end{document}