How to send huge JSON from body inside request? Jmeter

I want to test request which is sending JSON using body. How it looks in DevTools:

So i am clicking "view source" and i am coping whole that code.
Next stage is to paste that code into "Body Data" in my HTTP Request (JMeter). After 15 minutes of waiting i am able to see that result:

but JMeter is frozen as f... I have huge lag. This JSON is to much for this.
How can i paste something like that without this lag?

When i am trying to paste coded version it is pasted without lags. But as i can see coded version do not work :( i need to paste that json from "view source"