Lightbox on single images

I very much would like to use this plugin on my live site as it does exactly what I need on gallery images. However, I need the same lightbox functionality on single images inserted into posts, not just galleries.

Other than adding those single images as a gallery, is there a way to do this. I would be glad to pay for the feature request or purchase a premium version of this plugin if that the lightbox can be applied to single images.