Batch edit Link URL dialog for posts

There has to be an easy way to do this but I can’t find it. I’ve been adding images in my post for a long time with the Link URL field blank. I can easily add a link to the image in the Link URL field by clicking the Link to Image button. I want all my images now to be able to open in a Lightbox but each images need this Link URL filled with a link to the image. Is there any way to do a batch edit of this, I just want all images in my post to have the Link URL field to have a link to the image. Thanks for the help.