Wow…what is this evil device that can zap a phone in your pocket?
There are several hundred different components on the logic board that can be zapped and cause the phone to fail entirely. This may not be a CPU issue and chances are the data is stilled saved in memory. If Samsung is anything like Apple, they will do absolutely nothing to help you recover your data. The issue with the S8 is that the data is encrypted by default (unless you deactivated that feature) which means the only way to recover it is to fix the logic board.
So start searching for reputable repair shops that do micro-soldering work and data recovery on smartphones (avoid hard disk focussed shops as they generally struggle with phones).