You know however that upscaling cannot magically create quality from nothing. Most of those use algorithms to smoothen the pixelation from upscaling.
That being said… there’s an existing suggestion asking for an option to upscale the video to a different resolution
https://forums.plex.tv/t/feature-request-plex-server-to-upscale-video-resolution/199051
There’s also suggestions not to do that but deliver the video in its native resolution and let the tv handle the scaling (given it has dedicated chips / algorithms to do that.
