Marc,

It's very unlikely this will ever happen in Asciidoctor PDF. It's simply not the right technology stack for implementing this kind of layout (though never say never). I experimented with the idea once for a client {1}. But it isn't pretty. Prawn is not a general purpose layout engine, so it's necessary to drop down to low-level operations to place the text manually around the image.

There will be some news soon about a new strategy we're going to pursue for generating PDFs that leverages the browser layout engine, which opens the door to far more advanced layouts. You can find an early preview here: https://github.com/mogztter/asciidoctor-pdf.js

Cheers,

-Dan

:1: You can find a link to this code in this issue: https://github.com/asciidoctor/asciidoctor-pdf/issues/353