In PI Builder, can you specify the attribute configuration string for an element's associated attribute template?

This may sound like a simple question at first, but let me explain. I know it's possible to specify an attribute's configuration string using the "AttributeConfigString" header, like so:

 


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You can also specify an attribute template's value for an element derived from template using this syntax:

 


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I want to assign an attribute template's configuration string, rather than its value, for a given element, rather creating a whole new row for the attribute separately to do this. It might look something like this:

 


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Is this possible?