code: public static PactDslJsonRootValue valueFromProviderState(String expression, Object example) {
      PactDslJsonRootValue value = new PactDslJsonRootValue();
      value.generators.addGenerator(Category.BODY, "", new ProviderStateGenerator(expression));
      value.setValue(example);
      return value;
    }
docs: Adds a value that will have it's value injected from the provider state
  @param expression Expression to be evaluated from the provider state
  @param example Example value to be used in the consumer test