I want to use some NuGet packages inside Unity. I achieved that Unity finds the downloaded DLLs according to this article (https://www.what-could-possibly-go-wrong.com/unity
Just thought I'd add this in case it helps anyone
I used the Nuget for Unity asset (free) to import a package (websocketsharp) and it was really easy and painless. The references in VS worked immediately as well
The package you're trying to import naturally has to be compatible with Unity but that's the same even if you import it manually. So I'd recommend giving this a try