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There's an older library that uses a native DLL for HTTP/2 support but it's been deprecated a while: https://github.com/grpc/grpc/tree/master/src/csharp
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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vs-streamjsonrpc
The StreamJsonRpc library offers JSON-RPC 2.0 over any .NET Stream, WebSocket, or Pipe. With bonus support for request cancellation, client proxy generation, and more.
I've had a lot of success with StreamJsonRpc over named pipes, including your exact scenario (Framework talking to Core with a shared Standard library holding all the IPC stuff).