Is your feature request related to a problem? Please describe.

Feature request. Enable SIMD for the new Json APIs in ASP.NET Core 3.

Describe the solution you'd like

See SimdJsonSharp
With SIMD support, SimdJsonSharp is faster than any existing Json library on .NET.
I think the new Json APIs in ASP.NET Core 3 should add SIMD support to improve its performance.