How to configure nDisplay in MoviePipeline using python script?

Hi! I have been trying for days to solve the following problem:

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.

My example is :

my_config = unreal.load_asset(‘/Game/Sequence/Pending_MoviePipelineMasterConfig’)

ndisplay_render = my_config.find_or_add_setting_by_class(unreal.DisplayClusterMoviePipelineViewportPassBase)
ndisplay_setting = my_config.find_or_add_setting_by_class(unreal.DisplayClusterMoviePipelineSettings)
n_config = ndisplay_setting.configuration
n_config.use_viewport_resolutions = True
n_config.render_all_viewports = False

n_config.dc_root_actor = ???how to set

Thanks.