How to configure nDisplay in MoviePipeline using python script

I now need to use Python script to set the nDisplay in MoviePipeline, but I ran into a problem: I don’t know how to set the DCRootActor in the nDisplay TAB with Python statement.I hope you can help me.
Using the python language add a nDisplay configuration into the nDisplay MoviePipelinemasterconfig DCRootActor Settings.
such as:
ndisplay_setting = my_config.find_or_add_setting_by_class(unreal.DisplayClusterMoviePipelineSettings)
n_config = ndisplay_setting.configuration
n_config.dc_root_actor = ???how to set