ng-select : add an extra option

How can I add an extra item to my ng-select dropdown like the Create New in the following image :

This is the current code I have:

<ng-select
    [multiple]="true"
    [hideSelected]="true"
    [items]="robots"
    formControlName="RobotGUID"
    bindLabel="Name"
    bindValue="GUID"
>
    <ng-template ng-label-tmp let-item="item" let-clear="clear">
        <ng-container *ngIf="item.GUID">
            <span class="ng-value-icon left" (click)="onRobotEditClick($event, item.GUID)" aria-hidden="true">
                <i class="fas fa-edit btn-focus"></i>
            </span>
            <span class="ng-value-label">{{item.Name}}</span>
            <span class="ng-value-icon right" (click)="clear(item)" aria-hidden="true">×</span>
        </ng-container>
    </ng-template>
</ng-select>

I tried using <ng-option> but the item didn't appear in the dropdown. How can I add an extra item form the template?

You can use [addTag] and addTagText.

1. [addTag] : Allows to create custom options.
2. addTagText : Set custom text when using tagging.

app.component.html :

<ng-select [items]="cities" 
      bindLabel="name" 
      placeholder="Select city"      
      [(ngModel)]="selectedCity" 
      addTagText="Create New" 
      [addTag]="CreateNew">
</ng-select>

app.component.ts :

export class AppComponent {

    cities = [
        {id: 1, name: 'City1'},
        {id: 2, name: 'City2'},
        {id: 3, name: 'City3'},
        {id: 4, name: 'City4'},
        {id: 5, name: 'City5'}
    ];
    
   CreateNew(city){
     alert("Create New Clicked : "+city)
   }
}

Pictures :

1.

2.