Unfortunately, it has little to do with how popular the device is. The main thing is if someone has written a method to pull the annotations of the device in a way that matches how you want to use them. It also requires that the annotations are somewhere on the device that an external application can reach.
I maintain the Annotations plugin which can fetch annotations from Kindles. But, it stores them in a text field in the calibre library. They can be appended to the comments field or put in a custom column. But, there is no connection back to the text in the book. The annotations are fetched from the clippings file. People have suggested getting them from another file (an sdr?) but, reading this is not as simple as the clippings file. And as I have no Kindle to test with, it isn't practical for me to do it.
For adding the annotations into the book, I haven't heard of any method that does this. And I have never heard of the calibre viewer displaying them. Kovid has plans to implement better bookmarking/annotations in the calibre viewer, but I don't expect to see that any time soon.
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