How can i use multiple JSON files, into a Thread Group /(bzm - Concurrency Thread Group) of Jmeter 5.1.1, to do a concurrent testing?

using Jmeter 5.1.1, I want to do a concurrent testing. I use "Thread Group" or "bzm - Concurrency Thread Group" into a "Test Plan" of Jemter. I have to use multiple JSON files. so i created multiple HTTP requests and input JSON files into them. my Jmeter screenshot multiple JSON files are into multiple HTTP requests

Is it a Concurrent Testing?

How can I use multiple JSON files into a HTTP request?