ros2 node name to topic name mapping

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Hi,

I've a question on how to get some data from the ros2 graph.

For ex: with ros1,

if we run the command rosnode info /node_name, if gives us information about pubs, subs within the node.

But, with ros2 this does'nt seem to work. This is primarily because within ros2graph ,it does not create a map of node_name to topic_name.

And, it seems tricky as well to get this mapping. If we use the node_graph API's like get_node_names & get_topic_names_and_types.

When working with a global scope how do we get the mappings?

Please advice.