Create layers/comps based on JSON

Hi everyone!

I'm looking to make an instruction template using JSON in the style of How-To videos.

I have been doing this manually but it's very repetitive and got me wondering if this could be done as expressions and gathering the data from an external source file. 

For the most part this is a slideshow with some slides having various steps inside it, I would like to make the template adapt depending on how many items there are in the instructions. 

I've made a sample of the JSON file structure, but I foresee it containing stages slides and steps. A finally thought; I imagine at the level of the step: images and description texts could be null (interchangeable).

I imagine the data structure to be something like this:

{
	"instructionTitle":  "how to make a self-populating video",
	"mainImg": "%pathtoimg%/main.png",
	"stages": {
		"slide":{
			"step": {
			   "duration"; 100,
			   "img": "%pathtoimg%/0100.png",
			   "text": "Start with  JSON file",
			}
			"step":{
				"duration"; 400,
				"img": "%pathtoimg%/0102.png",
				"text": "Scratch your head",
			}
		  }
		"slide":{
			"step": {
			   "duration"; 800,
			   "img": "%pathtoimg%/0200.png",
			   "text": "Ask for help",
			}
		}
	}
}

What I'd like to know is, is it possible to count the stages and create comps based on the number of stages, import the images based on the image count etc?