I found out I can add a border by adding some definitions in my theme.
https://github.com/asciidoctor/asciidoctor-pdf/blob/main/docs/theming-guide.adoc#imageLike :
image:
border-color: cccccc
border-width: 3
But this creates borders to all block images, I think.
So how can I apply borders to only specific images?
How can I add the same border to inline images?
Is this even possible?
Thanks