Add field for e.g. Author
On the right side (right from Caption_Center) add a filed for e.G. Author

2 comments
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Federico commented
I would suggest it also to have the possibility to give credits to the PhotoSwipe plugin itself and eventual other plugins used for the website
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Paul Phillips commented
I think you can do this already.
<figcaption itemprop="caption description">
Long image description<!-- optionally define copyright -->
<span itemprop="copyrightHolder">Photo: AP</span>
</figcaption>