Zooming the images for opening animation is not supported as this does not work very well with squared thumbnails in Wordpress. However, some people may like to use with smaller images which are not squared thumbnails.
Todo:
Add option in the backend
Implement getThumbBoundsFn() in the frontend and set options for Photoswipe if zoom animation is enabled
Also see https://wordpress.org/support/topic/zoom-animation-when-opening-the-lightbox/
Zooming the images for opening animation is not supported as this does not work very well with squared thumbnails in Wordpress. However, some people may like to use with smaller images which are not squared thumbnails.
Todo:
getThumbBoundsFn()
in the frontend and set options for Photoswipe if zoom animation is enabled