By Alek Arend Tonight’s Thursday night game between Los Angeles Chargers and Kansas City Chiefs at Arrowhead Stadium is not on cable television. The AFC West battle is currently being broadcast on Prime Video. To watch the game, you must download the Prime Video app. The other requirement is an Amazon Prime account. If you don’t have one, the service is offering a free trial. “Tonight, we kick off a new era of @NFL Thursday Night Football only on @PrimeVideo. Huge team effort getting to this moment, and we can’t wait to deliver a great experience for Prime members this season + the next 10. Gi…