The images could be in a different folder, but you would need to set up a field to upload them to a different folder and then modify the filter when loading the field to only show that folder. I’m not sure how to do all of this, but is would not be easy. There is a topic here that discusses changing the upload path of an image field https://support.advancedcustomfields.com/forums/topic/change-file-upload-path-for-one-specific-field/ and there is a topic here that gives some information about modifying the media query for specific fields https://support.advancedcustomfields.com/forums/topic/filter-gallery-items/
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