I was assuming you were saving the JSON format to disk or webstorage/local storage, then using an AJAX Request to load the saved data. Then you can access it with LastData. Also assumed your JSON data came from an array to begin with.
For reference for your array load question, if you have the ""{"c2array":true,"size":[7,2,1],"data":[[[1286],[885]]... ect" data (JSON format of array data) in GlobalVariable, you can use Array.Load on that GlobalVariable.
But glad you figured it out anyway!