ng-expand-group
<ng-expand-group (expandedItem)="expandedItemSignal.set($event)">
<ng-expand label="Expand button label 1">
<p>This is the content 1</p>
</ng-expand>
<ng-expand label="Expand button label 2">
<p>This is the content 2</p>
</ng-expand>
</ng-expand>