We know this is a pain, but we are currently blocked by issues in available APIs. Once these issues are available, we will integrate this into the application.
ETAs from Microsoft are that this should be fixed by the end of the year.
We’ll keep you updated.
Just an update on the state of this.
Basically the import API (which is the one we use for the insane mode) tends to produce corrupted OneNote files at the destination. So as long as this is not fixed on their side we won't be using it since data integrity is one of our priority.
We are working along with Microsoft to try to get this resolved as soon as possible.