Kid3 Flatpak request

Project information:

Name: Kid3
Homepage: https://kid3.sourceforge.io
License: GNU General Public License (GPL)
Upstream has been contacted: No

I looked into this one, but I find it a rather hard nut to crack:
Github Branch

The real challenge lies in the large amount of plugins that are required: multiple utils to edit meta data, but also extra perl and doctools to actually build the project.