I learned in #27 that aa2cfe3 added a script to parse idefix logs into json. This sounds an awful lot like a tool I wrote several years ago, which is part of idefix-cli: idfx digest.
This tool is actually already needed to run the analysis part of particles benchmarks, I'm still maintaining it to this day and not planning to stop. Please use it, it's a much more robust implementation of read.py, it has documentation and continuous integration, and it's breaking my heart to see it going unused for the one problem it's here to solve.