How do I hide a series immediately upon loading?

[steuf0]

I have a graph with two series, but I want one of them to be permanently hidden from the user and just show its values on a shared tooltip.

But everytime I try to invoke the hideSeries() method, I get an error: ERROR TypeError: Cannot read properties of undefined (reading 'hideSeries')

This is what my code looks like (Angular 12):

 @ViewChild('chart', { static: true }) chart!: ChartComponent;

 this.chartOptions.series = [
     { name: 'Valor bruto', data: this.original_amounts },
     { name: 'Valor líquido', data: this.amounts },
     ];

ngOnInit(): void {
 this.hideSeries(); 
}

hideSeries() {
 this.chart.hideSeries('Valor líquido');
}

I've searched a lot for answers, tried many different approaches, but unfortunately nothing worked. I always get an error.

Am I doing something wrong here? Can a series be hidden immediately upon loading?