If you don’t care about type control.
In Angular 8 and higher versions
[(ngModel)]="$any(event).acknowledged"
From Offical Document: https://angular.io/guide/template-typecheck#disabling-type-checking-using-any
@Component({
selector: 'my-component',
template: '{{$any(person).addresss.street}}'
})
class MyComponent {
person?: Person;
}