Your Chromebox can't handle 4K HEVC video, not the conversion to 1080p.
Any 4K capable hardware can downscale without any issues.
Thanks super helpful!
You already got the same answer 2 hours ago on the Kodi forum.
It would be nice if you actually paid attention instead of creating a similar post on the LE forum.
Far as I know I haven't violated any posting guidelines, so....yeah, relax.