You can put json into array.
action > array > (JSON) Download > input string.
Then you can interpreter the array how you want.
Thanks for your response, but my problem/question is how do you get the tiles to display inside the Construct 2 editor?
I already have loading and saving working perfectly during runtime. What I would like to see, is to load the tiles into the tilemap object already in the editor view of Construct 2 (and not from TMX file but from a json (for example, Tilemap.AsJSON string generated in C2).