I am from Alibaba Cloud team. We provide cloud service for hosted Istio/Envoy as a mesh solution.
Some of our users are using Apache SkyWalking language agents in their services, now, they want to migrate to the Istio mesh solution.Apache SkyWalking has provided fully topology, metrics, and alarms solution in the service mesh scenario,
but we still want the Envoy could support tracing by following the SkyWalking data model, which is different from the Zipkin model.

The Context Propagation should follow this, Standard Header Item is enough for step one.
https://github.com/apache/skywalking/blob/master/docs/en/protocols/Skywalking-Cross-Process-Propagation-Headers-Protocol-v3.md

The spans should follow this,
https://github.com/apache/skywalking-data-collect-protocol/blob/master/language-agent/Tracing.proto#L28-L31

@lizan