如何去除tooltip内容中的“逗号”?echarts 折线配置项内容和展示

如何去除tooltip内容中的“逗号”

配置项如下
      option = {
        dataset: {
        source: [
            ['用电量:', 1, 55, 66, 2],
            ['用电量:', 2, 23, 23, 1],
            ['用电量:', 3, 38, 23, 1],
            ['用电量:', 4, 19, 23, 1],
            ['用电量:', 5, 22, 23, 1],
        ]
    },
    title: {
        text: '一天用电量分布',
        subtext: '纯属虚构'
    },
    tooltip: {
        trigger: 'axis',
        axisPointer: {
            type: 'cross'
        },
        formatter:function(e){
            var text="";
            for (var i = 0; i < e.length; i++) {
                text += "<font color="+e[i].color+">●</font> "+e[i].data[0] + e[i].data[2] + " - " + e[i].data[3]+"<br/>";
            }
            return text;
        }
    },
      legend: {
        data:['今天','昨天']
    },
    toolbox: {
        show: true,
        feature: {
            saveAsImage: {}
        }
    },
    xAxis:  {
        type: 'category',
        boundaryGap: false,
     
    },
    yAxis: {
        type: 'value',

        axisPointer: {
            snap: true
        }
    },
    visualMap: {
        show: false,
        dimension: 0
    },
series: [{
        name:'今天',
        type: 'line',
        encode: {
            x: 1,   
            y: 2,             
            tooltip: [0, 2,3]
        }
    },
        {
        name:'昨天',
        type: 'line',
        encode: {
            x: 1,   
            y: 3,             
            tooltip: [0, 2,3]
        }
    }
    ]
};

    
截图如下