portalTemplateDirective.ts

@Component({
    selector: 'app-test',
    template: `
        <ng-content [cdkPortalHost]="_portalInstance"></ng-content>
        <ng-template cdkPortal #cartCount>
           <div>Hello World</div>
        </ng-template>
    `
})
export class TestComponent implements OnInit {
    @ViewChild('cartCount') _portalInstance: TemplatePortal<any>;
        
    constructor() { }
    
    ngOnInit() {
      this._portalInstance = _portalInstance;
    }
}