There is such a bestiary of sidecar files now, Amazon must have felt the need to place some order on things. Unfortunately, it looks like they have broken your use case.
I don't think it is going to be possible until K4Mac can participate in the Personal Documents service. At that point, you notes and highlights will automatically sync and back up, and life will be even more beautiful. But it is one of those if and when questions. And it bears mention that it was not long ago that Mac did not support notes at all.
The other possibility is to reverse engineer the mbp1 and mbs files, and create a script to translate to mbp (which has already been somewhat reverse engineered).
Or get a KK for this purpose.
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