No somthing more than just “mere” syntax highlightinng or prettifying like e.g. in VS Code. Being able to change line height for a “headline” when you declare a new class. Or maybe lines that illustrate how a temp variable is used. But it’s all vague ideas and I can’t picture or describe it well and you’d have to demo this with a graphical design tool I think.
The F-droid app is complete garbage, also they don’t make it easy to install apps that are open source but don’t follow GPL. Obtainium is perfect, just point to git repository. Now all we need is a P2P source control service.