ExtendedFieldSearch and dynamic default value

Hello, I'm trying to create a dashboard with some sort of text field (eg: ExtendedFieldSearch) that has it's default value derived from a search of some sort, or from a setting. Is this possible within advanced charting dashboards?

maybe something along the lines of:

<module name="ExtendedFieldSearch"> <param name="field">aField</param> <param name="default">$someSetting$</param> <param name="intention"> <param name="name">stringreplace</param> <param name="arg"> <param name="something"> <param name="default"></param> <param name="fillOnEmpty">true</param> </param> </param> </param>

<param name="replacementMap"> <param name="arg"> <param name="something"> <param name="value"/> </param> </param> </param>