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Using the ROS 1 rqt_graph will conceptionally not be able to introspect anything from ROS 2. It can only "see" up to the bridge.

Once rqt has been ported to ROS 2 (and rqt_graph) then you can use that tool to visualize the ROS 2 side of your graph (again the ROS 2 tool won't be able to see any ROS 1 nodes / topics either).