Line with Marklines - Apache ECharts

import React, {Component} from 'react';
import ReactECharts from 'echarts-for-react';  // or var ReactECharts = require('echarts-for-react');
 
 
interface AppProps {}
interface AppState {}
 
let markLine: any = [];
const positions = [
    'start',
    'middle',
    'end',
    'insideStart',
    'insideStartTop',
    'insideStartBottom',
    'insideMiddle',
    'insideMiddleTop',
    'insideMiddleBottom',
    'insideEnd',
    'insideEndTop',
    'insideEndBottom'
] as const;
 
 
export default class EChartApp extends Component<AppProps, AppState> {
 
    constructor(props:any) {
        super(props);
        this.state = {
            name: "Charts React"
        };
    }
    option = {
        animation: false,
        textStyle: {
            fontSize: 14
        },
        xAxis: {
            data: ['A', 'B', 'C', 'D', 'E'],
            boundaryGap: true,
            splitArea: {
                show: true
            }
        },
        yAxis: {
            max: 2
        },
        series: [
            {
                name: 'line',
                type: 'line',
                stack: 'all',
                symbolSize: 6,
                data: [0.3, 1.4, 1.2, 1, 0.6],
                markLine: {
                    data: markLine,
                    label: {
                        distance: [20, 8]
                    }
                }
            }
        ],
        grid: {
            top: 30,
            left: 60,
            right: 60,
            bottom: 40
        }
    };
 
    func =()=> {
        for (var i = 0; i < positions.length; ++i) {
            markLine.push({
                name: positions[i],
                yAxis: 1.8 - 0.2 * Math.floor(i / 3),
                label: {
                    formatter: '{b}',
                    position: positions[i]
                }
            });
 
            if (positions[i] !== 'middle') {
                const name =
                    positions[i] === 'insideMiddle' ? 'insideMiddle / middle' : positions[i];
 
                markLine.push([
                    {
                        name: 'start: ' + positions[i],
                        coord: [0, 0.3],
                        label: {
                            formatter: name,
                            position: positions[i]
                        }
                    },
                    {
                        name: 'end: ' + positions[i],
                        coord: [3, 1]
                    }
                ]);
            }
        }
    }
 
 
    render() {
    this.func()
        console.log(this.option)
        return (
            <div>
                <ReactECharts
                    style={{width:'1900px',height:'1000px'}}
                    // echarts={echarts}
                    option={this.option} // required
                    // notMerge={true}         // optional
                    // lazyUpdate={true}       // optional
                    // theme="my_theme" // optional
                    // onChartReady={this.onChartReadyCallback} // optional
                    // onEvents={EventsDict}
                    // opts={}
                />
            </div>
        );
    }
}