How to add select all option to ion-select in ionic 5

I tried adding ion-select-option and then tried to handle select all logic in the change event but change event doesn’t fire at all. seems it doesn’t support events

    <ion-item>
        <ion-label>Test</ion-label>
        <ion-select [(ngModel)]="selectedValues" multiple="true">
            <ion-select-option (ionChange)="selectAll()">Select All</ion-select-option>
            <ion-select-option [value]="option" *ngFor="let option of  items">{{option}}
            </ion-select-option>
        </ion-select>
    </ion-item>

sample https://stackblitz.com/edit/ionic-5-angular-10-start-template-hure6j?file=src/app/tabs/tabs.page.html

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