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You can also check out CodeMonkey's tutorials of ECS on youtube. He actually goes over using 2d sprites and implements the z-sorting.
Perhaps you should take a step back, and re-evaluate your decision. A mild examination of your code would indicate that what you are trying to do...
So for a 2d <> 1d conversion, the above math is pretty simple to convert to a function. What you would do is place a function below the Execute()...
For some reason that I cannot fathom at this time, IJobParallelForBatch does not allow for multiple similar type declarations at the job level....
How exactly IS the data being generated and stored? Anything you can share? I myself have been playing with Minecraft-style terrain generation...