title: Can't set title of highchart through @input
body: <p>I initialize my Highcharts like this:</p>
  <pre><code>export class StreamsComponent implements OnInit {
    @Input() platform: string = &quot;&quot;;
    @Input() title: string = &quot;&quot;;
  
    series: any[] = [];
  
    Highcharts: typeof Highcharts = Highcharts;
    updateFlag: boolean = false;
    chartOptions: Highcharts.Options = {
      title: {
        text: this.title
      },
      chart: {
        zoomType: &quot;x&quot;,
      },
      xAxis: {
        type: &quot;datetime&quot;,
      },
  
      yAxis: {
        title: {
          text: &quot;&quot;,
        },
      },
  
      legend: {
        enabled: false,
      },
      credits: {
        enabled: false,
      },
  
      series: this.series,
    };
  ...
  </code></pre>
  <p>Later I populate this.series in a service callback with this.updateFlag = true; This all works fine.</p>
  <p>But the title isn't set and remains empty.</p>
  <pre><code> ngOnInit(): void {
      console.log(this)
   ...
  </code></pre>
  <p>When I check the object in ngOnInit(), the title has the content like I wanted, but it isnt visible in the Graph. When I just put a random string in, it is visible.</p>
  <p>Any ideas?</p>