Thank you for your input. resources.GetRemote looks really intriguing but I’ll refrain from using it with respect for the resource usage.
In the future, would it be possible for Micro.blog to maybe expose the width/height properties as metadata in the post front matter? (Or expose these properties in some other way?)
And maybe also expose the Exif-data that Hugo can serve from a resource? It would be neat to be able to add some additional camera information to the photos.