Yes, I am working on a file exporter, following the experimental OpenTelemetry Protocol File specifications, https://opentelemetry.io/docs/specs/otel/protocol/file-exporter/

If there is something different you want, feel free to raise an issue describing what you want. I have previously done rotating file exporters, including one for Microsoft.Extensions.Logging that is still usable https://github.com/sgryphon/essential-logging/tree/main/src/Essential.LoggerProvider.RollingFile