You would need to build custom JavaScript to do this. The image field is actually set to the attachment ID of the image, so the uploading of the image happens before the image is set in the image field. I have an example of dynamically populating an image field here https://github.com/Hube2/acf-dynamic-ajax-select-example/tree/master/dynamic-fields-on-relationship
And this does not take into consideration the upload field used for people that are not logged in or do not have access to the media library. This upload works through a different mechanism.
