Code element in Upfront and Cform plugin

Hello,
i work with Upfront/Spirit to redesign my company website.
We use the Cform2 plugin. It could be inserted with the code <!--cforms-->
I've tried to set this with the Code Element of upfront but the call to the plugin doesn't work.
How could i use the code insertion with the code Element. As an alternative is it possible to use PHP syntax with that Upfront element ?
Thank you