Assign too large Json to a String-like variable

I want to run tests on an algorithm I'm developing with this Json .

In order to test this type of input, I would always create a variable assigning json between strings, so the variable would get the string content in several lines and then use Json.parse() to convert the string to a Json object, however, this Json there in specific, I can not assign it in string form using the crase, I believe because it is very large. What can I do in this situation?