✅ Adding reference with CLI

How can i reference System.Numerics with the CLI ?
Tried

dotnet add reference C:\Windows\Microsoft.NET\Framework\v4.0.30319\System.Numerics.dll

dotnet add reference C:\Windows\Microsoft.NET\Framework\v4.0.30319\System.Numerics.dll

but it says that System.Numerics is an invalid project

✅ Adding reference with CLI - C#