@Beniamina: The short answer is that there is no way to extract the annotations supplied by Kobo. The long answer is that it has been discussed here many times with a few different solutions. As nothing has changed about this since the last time it was discussed, I recommend doing a search in the forum for the previous discussions.
Also, the KTExtractAnnotations tool was written and posted here a while ago by a member here, tshering. It should still work, but it has been a long time since I tried it.
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