can I print parameterDescription ?

You'll need a custom scriptlet for that, $P{..} exposes the parameter value.

In the scriptlet you can write a method that does the following:

    public String getParameterDescription(String paramName) {
        JRFillParameter param = parametersMap.get(paramName);
        return param == null ? null : param.getDescription();
    }

Then you would do $P{REPORT_SCRIPTLET}.getParameterDescription("paramName") in the report.

Regards,

Lucian