I should have posted this on a somewhat more relevant site for “Apache Echarts”.
I solved the problem by doing this:

option = {
    dataset: {
        source: [
            ['Date', 'Value'],
            ['2020/12/31', 120],
            ['2021/04/01 10:00', 20],
            ['2021/04/01 21:00', 25],
            ['2021/05/06', null],
            ['2021/08/30', -10],
            ['2021/08/09', 70],
            ['2025/04/24', 110],
            ['2025/06/14', 130]
        ]
    },
    dataZoom: [
        {
            show: true,
            realtime: true,
            start: 0,
            end: 100
        },
        {
            type: 'inside',
            realtime: true,
            start: 0,
            end: 100
        }
    ],
    tooltip: {
        trigger: 'axis'
    },
    xAxis: {
        type: 'time',
        min: 'dataMin', // case sensitive !!
        max: 'dataMax'
    },
    yAxis: {
        type: 'value',
        min: 'dataMin', // case sensitive !!
        max: 'dataMax'
    },
    series: [{
        type: 'line', encode: {x: 0, y: 1},
        connectNulls: false,
        smooth: true,
        symbol: 'circle',
        symbolSize: 14,
        lineStyle: {
            color: '#5470C6',
            width: 6,
            type: 'solid',
            shadowColor: 'rgba(0, 0, 0, 0.5)',
            shadowBlur: 8,
            shadowOffsetX: 3,
            shadowOffsetY: 3
        }}],
    itemStyle: {
        borderWidth: 2,
        borderColor: '#5470C6',
        color: '#5470C6'
    }

};