Renders the list item content. To define the item template, nest an <ng-template> tag
with the kendo<ComponentName>ItemTemplate directive inside the component tag. The template context is
set to the current component. To get a reference to the current data item, use the let-dataItem directive.

selector: 'my-app',
template: `
 <kendo-combobox [data]="listItems">
   <ng-template kendoComboBoxItemTemplate let-dataItem>
     <span>{{dataItem}} option</span>
class AppComponent {
  public listItems: Array<string> = ["Item 1", "Item 2", "Item 3", "Item 4"];