ROS2 Map of Parameters

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Hi,

In the navigation2 stack, we make use of alot of plugin factories (loading a map of plugins where the plugin pointer is stored to a name key to call).

I was wondering if maps were now supported from with ROS2 parameter so I can parse this or similar

{{key: value}, {awesome_controller_name: registered_plugin_type}}

If its possible, can you provide an example? If its not possible, is there a ticket filed?