ng-apexcharts Angular 16 - Cannot read properties of undefined (reading 'dataURI')

[Tfasesa]

No encuentra referencia del objeto apexchart "undefined",
En el componente:
import {
ApexAxisChartSeries,
ApexChart,
ChartComponent,
ApexDataLabels,
ApexPlotOptions,
ApexResponsive,
ApexXAxis,
ApexLegend,
ApexFill,
NgApexchartsModule
} from "ng-apexcharts";
import * as ApexCharts from 'apexcharts'

@component({
selector: 'app-grafica1',
standalone: true,
imports: [ NgApexchartsModule,
...

...
@ViewChild('chart') mychar: ChartComponent;
...
..
this.chartOptions = {
series: [
..
this.mychar.dataURI().then(function (e) {
....

Html:
<apx-chart #chart
[series]="chartOptions.series"
[chart]="chartOptions.chart"
[dataLabels]="chartOptions.dataLabels"
[plotOptions]="chartOptions.plotOptions"
[responsive]="chartOptions.responsive"
[xaxis]="chartOptions.xaxis"
[legend]="chartOptions.legend"
[fill]="chartOptions.fill"
[colors]="chartOptions.colors"
>

Error:
ERROR TypeError: Cannot read properties of undefined (reading 'dataURI')

Package
"apexcharts": "^3.44.0",
"ng-apexcharts": "^1.8.0",
"@angular/cli": "~16.1.0",

El gráfico se presenta sin problemas, funciona bien la parte visual, pero al exportar desde script con la función dataURI presenta problema

Agradezco puedan ayudarme con el error