Your plugin looks good and I am starting playing with it. One thing I don't succeed to change: te "Grouping by" option. It uses Story Point and it is pretty useless to me. How could I remove it? Or change it to "Component" ?
My Gantt-Chart interpretes the ORDER-BY-clause of the JQL associated to the chosen filter: please have a look at your "issues by epic". If you change it to e.g. "... ORDER BY project, fixVersion, component" and reload the Gantt-Chart, selecting that filter should result in the following sample:
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