complex data query for wordpress

I have complex data must be saved to wordpress. I saved it in json and it really easy.
But I want to query it too, like query post in wordpress. Query this data should be fast, multisite support.

Complex data:
– 3,4 level
– have list in child item

Like this:

{
	"title": "Education",
	"heading" : "My Education",
	"description" : "blalalalal",
	"educations" : [
		{"school" : "Univert Oxfor 1", "major" : "Software Engineer", "mark" : "7.8", "description" : "sdf sfs df sdf"},
		{"school" : "Univert Oxfor 2", "major" : "Software Engineer", "mark" : "7.8", "description" : "sdf sfs df sdf"},
		{"school" : "Univert Oxfor 3", "major" : "Software Engineer", "mark" : "7.8", "description" : "sdf sfs df sdf"},
	]
}

I don’t know solution for this on wordpress. Please help me on this.
Thanks so much!