[Solved]-Highcharts network graph custom link labels-Highcharts

Use linkFormat or linkFormatter with the correct reference to the property, for example:

    series: [{
        ...,
        dataLabels: {
            enabled: true,
            allowOverlap: true,
            linkFormat: '{point.label}'
        },
    }]

Live demo: https://jsfiddle.net/BlackLabel/jfbwLhp3/

API Reference: https://api.highcharts.com/highcharts/series.networkgraph.dataLabels.linkFormatter