YAG Metadaten

Guten Morgen
Ich bastle an einer kleinen Erweiterung für YAG (Photoswipe). Die Erweiterung funktioniert bereits einwandfrei, aber ich wuerde noch gerne die Metadatem der Images anzeigen. Check es nicht, wo und wie ich diese abholen muss.
Bitte euch um Hilfe, Danke jetzt schon dafür.
Gruss Markus

Mein Template (<figcaption> {itemmeta.iso}....):

{namespace yag=Tx_Yag_ViewHelpers}


<div class="yag_mkmphotoswipe" itemscope itemtype="http://schema.org/ImageGallery">
	<f:for each="{listData}" key="rowIndex" as="listRow">
		<figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
			<a href="{yag:resource.image(item:listRow.image.value)}" data-size="{listRow.image.value.width}x{listRow.image.value.height}">
				<img src="{yag:resource.image(item:listRow.image.value, resolutionName:'thumb')}" itemprop="thumbnail" height="{listRow.image.value.height}px"
				/>
		
				<f:if condition="{config.settings.item.showTitle}">
					<f:if condition="{listRow.image.value.title}">
						{listRow.image.value.title}
					</f:if>
				</f:if>
				<f:if condition="{config.settings.item.showDescription}">
					<f:if condition="{listRow.image.value.description}">
					</f:if>
				</f:if>
			</a>		
			<figcaption itemprop="caption description">{listRow.image.value.description}<br />{listRow.image.value.title}<br />


				{itemmeta.iso}


			</figcaption>
		</figure>
	</f:for>
</div>






<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
	<div class="pswp__bg"></div>
	<div class="pswp__scroll-wrap">
		<div class="pswp__container">
			<div class="pswp__item"></div>
			<div class="pswp__item"></div>
			<div class="pswp__item"></div>
		</div>
		<div class="pswp__ui pswp__ui--hidden">
			<div class="pswp__top-bar">
				<div class="pswp__counter"></div>
				<button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
				<button class="pswp__button pswp__button--share" title="Share"></button>
				<button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
				<button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
				<div class="pswp__preloader">
					<div class="pswp__preloader__icn">
						<div class="pswp__preloader__cut">
							<div class="pswp__preloader__donut"></div>
						</div>
					</div>
				</div>
			</div>
		<div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
			<div class="pswp__share-tooltip"></div> 
		</div>
		<button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
		</button>
		<button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
		</button>
		<div class="pswp__caption">
			<div class="pswp__caption__center"></div>
		</div>
		</div>
	</div>
</div>