如何从 Highchart 中仅从 Grand Summary 系列中删除每个柱线的总计

var seriesData = [
    {
        "data": [
            690,
            230,
            230,
            230
        ],
        "name": "Grand Total For Each Bars"
    },
    {
        "data": [
            230,
            100,
            100,
            100
        ],
        "name": "April"
    },
    {
        "data": [
            230,
            50,
            50,
            50
        ],
        "name": "May"
    },
    {
        "data": [
            230,
            80,
            80,
            80
        ],
        "name": "Jun"
    }
];

seriesData[0].data[0] = null;

var categoriesData = ['Grand Summary', 'April', 'May', 'Jun'];

Highcharts.chart('container', {
    chart: {
        type: 'column'
    },
    title: {
        text: 'Remove Grand total for each bars in Grand total sumary series group',
        align: 'left'
    },
    xAxis: {
        categories: categoriesData,
        type: 'datetime',
        title: {
            text: null
        },
       
    },
    yAxis: {
       
        title: {
            text: '',
            align: 'high'
        },
        labels: {
            overflow: 'justify'
        },
        gridLineWidth: 0
    },
    
    series: seriesData
});

.highcharts-figure,
.highcharts-data-table table {
    min-width: 310px;
    max-width: 800px;
    margin: 1em auto;
}

#container {
    height: 400px;
}

.highcharts-data-table table {
    font-family: Verdana, sans-serif;
    border-collapse: collapse;
    border: 1px solid #ebebeb;
    margin: 10px auto;
    text-align: center;
    width: 100%;
    max-width: 500px;
}

.highcharts-data-table caption {
    padding: 1em 0;
    font-size: 1.2em;
    color: #555;
}

.highcharts-data-table th {
    font-weight: 600;
    padding: 0.5em;
}

.highcharts-data-table td,
.highcharts-data-table th,
.highcharts-data-table caption {
    padding: 0.5em;
}

.highcharts-data-table thead tr,
.highcharts-data-table tr:nth-child(even) {
    background: #f8f8f8;
}

.highcharts-data-table tr:hover {
    background: #f1f7ff;
}

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>
<script src="https://code.highcharts.com/modules/export-data.js"></script>
<script src="https://code.highcharts.com/modules/accessibility.js"></script>

<figure class="highcharts-figure">
    <div id="container"></div>
    <p class="highcharts-description">
      
    </p>
</figure>