Broadcaster Dynamic Variable from Query/ View/ Workbook

Hi Gurus,

I need your opinion on the broadcasting setting that I am doing, we need to automate all the variable that is on broadcasting, currently we are manually modifying the variable screen that was from more than 200 workbook that was saved from a query. is there an option that every time we refresh the workbook, all the broadcasting setting that was created from that workbook as source, the variable for the date will be dynamically change also.

if you have options to automate this part, because we automated the variable from the query, base on system date. so hoping that the variable will be change also in the created broadcaster.

thank you in advance.