Custom validator

We are using Gatling as a stress test and in the same way as a API integration test framework and in this case we need to generate json requests and recieve json response, validate mapping and in the same way values. For now I just use standard checks with a Jsonpath and Gson classes for request building.
But may be there is some way to build custom validator with a combination with some Json parser like Play, Boon or Jackson in order to validate response.
Maybe someone know the proper way how to deal with this?