JMeter - Adding a json response from a file and set it as response body in a get request

Im doing some json validating. I need to be able to add a local json file to a response in dummy sampler. This because i need to validate new json files every day. I figure out that i might use the JSR223 Post Response to get the file from a folder then set the Sampleresult.setResponseData to JSON.

Is there anyone who have a clue how i fo this?