Ion-select and the possibility to add element

I want to create a select multiple option (in a form) and let the possibility to the user to add new element.
Something like this :

<ion-select name="skills" #skills="ngModel" [(ngModel)]="userData.skill" required multiple="true">
              <ion-option *ngFor="let skill of skillsData" [value]="skill.skill">{{skill.skill}}</ion-option>
              <ion-input type="text" ngModel required name="firstName"></ion-input>

If the user creates a new element, it must be added to the ion-select option.
It’s possible ?

Thanks !