Upscale FCPX 1080p to 4K HEVC

I have a FCP project that is 1920 x 1080p. Can I upscale it to 4K i.e. 3840 x 2160? I don't want to select Apple Device... as that creates a .mov file. On low end 4K TVs the upscaling isn't very good like it is on a top of the line Sony TV. I would like to upscale on the Mac and see if it looks better sending it straight to my 4K TV so no scaling needs to be done. I can buy Compressor if that will work. Also it must be a .mp4 file since most TVs do now recognize .mov files. It can be either H.264 or HEVC. I don't want to buy another application or a web service. If it can be done in FCP or Compressor a screen shot of the setting would be great.