Get source_identity as a header or make it accessable to nodejs SDK

When debug is turned on I see:

ziti-sdk-nodejs//home/runner/work/ziti-sdk-nodejs/ziti-sdk-nodejs/src/ziti_listen.c:490 on_listen_client(): on_listen_client: incoming connection from

So far I have been unable to access this value or anything like it from within nodejs itself running as an http server. The application I have in mind requires us linking requests with the ziti identity that the source is coming from.

Is anyone aware of how this might be done?