You can see an example of the output here: https://godbolt.org/z/aan6Kfxds (that's the first example from the article, with -fdiagnostics-format=sarif-stderr added to the command-line options)
I experimented with SVG output for the diagrams, but didn't get this in good enough shape for GCC 14.
I did attempt to use the SARIF output just after your previous blog post a year ago, with a CMake based project, but after an hour I still wasn't able get the warnings to show within the context of the source code.
The -fdiagnostics-format option isn't even in the GCC documentation, your blog post is the only place where I saw it mentioned.
In short: I'd love to use GCC's analyser, and tried it several times, but my bottleneck is usability, ease of setup, and a proper interface to help sort out the many false positives from the true issues.