Passing XML tags as parameters to a graf definition in RTF Template

The regular graph dialog lets you fill in some options for your graph, but writes down an XML for the actual

configuration. The Advanced tab lets you enter more values (and then disables the regular tab from now on

in).

What I'm trying to achieve is to pass an entire element as a parameter, into this XML.

I can already achieve something like this in the XML : <Title text="{//P_MY_TITLE}" visible="true">

Running the the report with parameter P_MY_TITLE="Bob" will render the graph with title "Bob"

What I'd want to do is have something like "{P_TITLE}" in the XML and then run the report with parameter