It is posible work with variables in jelly view that has not a ParameterDefinitionProperty?

[Ramón Rial]

I am developing a plugin with variables passed as part of parameterMap.
I need throw same variables (who has no descriptor) to a forwaderd page.
Is this posible?
Can I work with request object in jelly view? Something as:

${request['attribute']}

This would be very useful for my plugin, for working with 
req.getParameterMap().getParameter("attribute").