Be aware that the format is fairly inefficient, if your cron jobs write a lot, the files may become large. You may be better off investing into some good logging instead.
Certainly not as efficient as just outputting the STDOUT into a line-delimited format, but not inordinately larger.
Logging would be too much (need some logging endpoint/log shipper etc) but the other upside is that I can see exactly how it plays out and when and what gets stuck. The actual console output of the command as it progresses.
Think terraform.