柱状图normal数据显示重写

series: [
        {
            name: '直接访问',
            type: 'bar',
            stack: '总量',
            label: {
                normal: {
                    show: true,
                    position: 'insideRight',
                    formatter:"'{c}%'"
                }
            },
            data: [320, 302, 301, 334, 390, 330, 320]
        },

formatter