Caption

<p-galleria [(value)]="images" [responsiveOptions]="responsiveOptions" [containerStyle]="{ 'max-width': '640px' }" [numVisible]="5">
  <ng-template pTemplate="item" let-item>
    <img [src]="item.previewImageSrc" style="width: 100%; display: block" />
  </ng-template>
  <ng-template pTemplate="thumbnail" let-item>
    <div class="p-grid p-nogutter p-justify-center">
      <img [src]="item.thumbnailImageSrc" style="display: block" />
    </div>
  </ng-template>
  <ng-template pTemplate="caption" let-item>
    <h4 style="margin-bottom: 0.5rem; color: #ffffff">{ { item.title } }</h4>
    <p>{ { item.alt } }</p>
  </ng-template>
</p-galleria>