Sorry, this isn't helpful. I migrated the hard way, hah. I just went to each page in OneNote and hit ctrl+a, copied that and pasted without formatting into TriliumNext, then fixed the formatting.
It took some time, but was worth it to me. I figured it would be a good test to help me familiarize myself with TriliumNext a little.
An easier path to help adoption would probably go a long way, but it also might eat up a lot of development time and routinely need work. I'm not sure how often the OneNote export formats change.
Let's not forget an important distinction here. This man is not making any of these things, and he isn't capable of making them. But, he is capable of directly and indirectly impacting the people who are capable of making them negatively enough that we get utter failures like the cybertruck.
Don't give him more credit than he deserves.