As sebb said you can use __V() similarly to __P(). There's also the __javaScript as one of the alternatives. Another, is using __eval() as it will process the content of the named variable and return the resulted variable content. As Erez said there's the alternative of using a BeanShell pre-proceasor and, as well, the __BeanShell() function.
__javaScript() function is the least performatic of the alternatives, followed closely by BeanShell.
