I think we can get the coordinates of the category boundaries with a bit of code. Those should be pretty safe for placing page breaks.
Just a word of warning. This is not currently exposed as a public API and can potentially change.
var chart = e.sender;
var axis = chart._plotArea.categoryAxis;
var ticks = axis.getMajorTickPositions();
See this snippet
Note that these are coordinates relative to the chart element.
I hope you'll be able to integrate this with the export solution you're using.
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