Chromeback issue with HEVC video playback, stuttering



I have a recent Chromebook with Play store, its about a year old. when I play any videos on K that are HEVC they always stutter, I have read to install HEVC addon, but I have not found it. I’m able to play none HEVC videos, there has to be a way to play HEVC video file ?? Any info would be greatly appreciated. I’m on K 21.1

DB