Exporting with custom data label image in highcharts gantt

In the below examples, I've tried to put the image of each point (img tags in custom data labels) in the exported file but, they would be disappeared after exporting. Link of examples: https://jsfiddle.net/meysamm22/eohdp897/3/

or: https://jsfiddle.net/BlackLabel/y02sjkvg/

I've also used some related options, but they didn't help me.

exporting: {
            allowHTML: true,
             width: 5200,
            sourceWidth: 3200,
            chartOptions: {
                plotOptions: {
                    series: {
                        dataLabels: {
                            enabled: true
                        }
                    }
                }
            }
        }