I need to load a js file that puts a variable, wfxtrigs, in the global namespace. Then, I need to process this variable into a js_page variable that can be mapped into the Google Publisher Tag(GPT). I want to use Tealium to do this, so that it can easily be turned on or off. I tried using the Tealium Custom Container tag and setting the Custom Script Source to the url of the js file. Since this file returns a basic js variable assignment, I get a warning that the page was interpreted as script but returned as plain text. It does load the variable in the global namespace, but it is not there before the GPT processes. Is there a prescribed way in Tealium to do what I want to do?