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A very cheap way of getting all the netstandard2 dependencies together in one place for the sake of Unity's bullshit is to create a vestigial .NET Framework 4.7 library that imports all of the .NET Standard 2.0 libraries you care about, and then set its output directory to somewhere within your Unity project's Assets/Plugins directory.

There is a nuget Unity library that will do this for you (and more) https://github.com/GlitchEnzo/NuGetForUnity

You can get nuget to work by having it put the packages under the Asset folder but you'll need to manually clean up targets you don't want. Unity has its own (a few actually =/) package system.