Changing grouping for bookmarks of appendix

Question

I have an appendix with multiple chapters, while I like it that the main chapters of the document appear on the highest hierarchy level in the bookmarks, I would like the appendix chaptes to be children of the appendix bookmark. It would be even better if i could prefix the chapter number

I have this for the bookmarks

Appendices
Additional Images
Additional Code

and would like this

Appendices
|-A Additional Images
|-B Additional Code

MNWE

\documentclass{report}
\usepackage{hyperref}
\usepackage[toc,page]{appendix}
\begin{document}
\begin{appendices}
    \chapter{Additional Images}
    blah
    \chapter{Additional Code}
\end{appendices}
\end{document}

Answer 1

With package bookmark, the level of the next bookmark entry can be changed via \bookmarksetupnext. In this case, the level of the appendix bookmark should behave as \part (numeric value -1):

\bookmarksetupnext{level=part}
\begin{appendices}
  \chapter{...}

Full example:

\documentclass{report}
\usepackage{hyperref}
\usepackage[toc,page]{appendix}
\usepackage{bookmark}
\bookmarksetup{open,numbered}
\begin{document}
\chapter{Introduction}
\section{Section A}
\chapter{Summary}
\bookmarksetupnext{level=part}
\begin{appendices}
    \chapter{Additional Images}
    blah
    \chapter{Additional Code}
\end{appendices}
\end{document}