I took a quick look at the Kindle Scribe firmware to see what is different from previous models. As far as I can tell the handwritten annotation features are tightly tied to KFX format. The kfxreader application was changed significantly. The templates for notebooks, like checklist and daily planner, are single page KDF documents (KFX in an SQLite wrapper) containing KVG (Amazon's proprietary version of SVG) images.
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