How to import data from a json file? I am trying to import 10k articles

Could you please elaborate on how you do that? I find this for creating a JSON field but I dont understand too much of it. I have the json file and the mysql table of the data and I know how to import an existing table but don’t know how to create a content-type based on it.

I was hoping to import the json file, but If I can just import the table and create a content type that would be better.