The Antora based documentation allows a user to click on an image. The code for this looks like this:
An alternative would be to add "lightbox" support (=enlarge image on click) for the Antora template. This would reduce the markup to
An example can be found here: https://intellij-asciidoc-plugin.ahus1.de/docs/users-guide/quick-start.html
I've also started a discussion to make it part of the standard Antora UI: https://gitlab.com/antora/antora-ui-default/-/issues/140.
Please let me know if you'd like to see a pull request for this for Isis including a clean-up of the AsciiDoc code (even before it is part of the standard Antora UI).