Hardware recommendations for Jellyfin please?

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So 4K transcoding, my understanding, is not dependent upon the hardware acceleration (i.e., the iGPU in your NAS) but on the CPU due to tonemapping, which can tax less powerful machines. Your machine should be more than capable if you aim for media that is fully compatible with your hardware or keep two separate libraries of 1080p or non-HDR/DolbyVision and another that is 4K+HDR/DV. I avoid transcoding 4K like the plague despite having a machine more than powerful enough to do so. I'd rather transcode and tonemap on my own with ffmpeg, where I have more control over parameters and create a scenario where transcoding is minimal if it happens at all.