Sub flow context

I’m new to prefect and I’m trying to use context variable that is defined in the parent flow in his child flow.

in the parent flow I retrieve the context variable like this:
user_id = global_context_variables.FlowRunContext.get().flow_run.context.get(“user_id”)

but if I run a sub flow which have the same line the value of user_id is None.

Is there a way to transfer the context to the sub flow?