Of course I document my export format too so others can do the same with data from my app: https://github.com/TheLastProject/Catima/wiki/Export-format :)
The sad part is the allowed 30 days timeframe. Stocard really abuses this to make you wait as long for your data as they legally can make you wait: https://twitter.com/SylvieLorxu/status/1389343401435439112