Hey, I just discovered this project. Very cool. Is there a way to add captions to images (e.g. a title or some metadata)? I saw that in the template.go there is something about a caption but I wasn't able to find any related code how to add captions to images.
https://github.com/moulco/moul/blob/bfe9508bb78acff67a0979cc9751309ecf7d0fa0/internal/template.go#L514-L516

If this is currently not possible it might be a useful feature in the future.