docs: public static void acceptsJson(OptionParser parser) {
          parser.acceptsAll(Arrays.asList(OPT_J, OPT_JSON),
                            "fetch key/entry by key value of json type")
                .withRequiredArg()
                .describedAs("key-list")
                .withValuesSeparatedBy(',')
                .ofType(String.class);
      }