How to Update Theme file automatically across all reports?

Hello! 
I am looking to see if it's possible to update a json theme file and then it refreshes across all our reports automatically? We've recently updated all our reports and just now re-iterated the file so do we have to update each report with the updated file, or is there a way to update all reports in one shot? 
I doubt it, but figure it's worth a shot! Maybe a suggestion for a future update to PBI?

Thank you,