Export a TextBox value in a Report with Script

Hi,

I'm generating a report through a script in order to use multiple DataSet.
It's working fine to link data from SQLQuery to my rapport.

My issue is that I want to "link" a value of a TextBox (which is not included in any databse) to my report DataSet.

On a simple "Report" action, I can add throug "Components involved in the search" which puts data into "Variables => Components" in the report design.

How to make it with a script ?

Regards