The script is available now at:
@hans Currently index-v1.jar is only used to select the apps within fdroiddata. While reading the json file itself was fine, I got stuck (on converting it to the data format the package tm uses) and rather published it on GItLab as is.
Setting up might be a bit tedious but then the script needs just about 5 minutes for the ~1750 diagrams (100 MByte) and the sorted list.
I’d be happy if someone gives the script a run:)