Short description of what this feature will allow to do:

Add an option to display an image preview to the ImageField. Maybe passing a view (Twig) that would receive the entity/instance?

Example of how to use this feature

Here's a theoretical implementation:

ImageField::new('thumbnailName')->setPreviewTemplatePath('admin/media/thumbnail-preview.html.twig')

This view would be prepended or appended to the current file uploader.
I would have loved to propose a PR for such a request, but I currently don't understand how it would be possible.

Any help would be appreciated 😉