yes - Tinderbox could help solving your task. It still will require some work to set up the system. But you could start small and improve your solution step by step.
First task is to import the notes in a way you could work with them in TBX. This is easy for some parts but If you speak of files > 100k you will have to split them into several smaller packages (and still maintain the relation between the notes) otherwise it will be harder to extract the main subject and all the sub-topics from this large text object. A nice option is the use of AI within TBX - this can (!) help to add meta information to your notes - that’s what I do with ChatGPT here.
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