You're going to want to hit the "Mobi" forum for anything detailed, but basically, I'm unaware of a chapter jump tag. Chapter navpoints are implemented by feeding Kindlegen (or other conversion software) an epub (or OEBPS source) that has a valid toc.ncx file. No NCX, no jump points. The opf file will contain the entries that determine the Beginning, TOC, and Cover--as well as the details to where the NCX file can be found.
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