import bpy
path = "D:\virtual_imagery\render_data\plot_row\procedural-scene.blend"
with bpy.data.libraries.load(path) as (data_from, data_to):
    setattr(data_to, "scenes", ["procedural"])
bpy.data.scenes.remove(bpy.data.scenes["Scene"], do_unlink=True)
print(bpy.context.scene.node_tree.nodes["Hue Saturation Value"].inputs["Hue"].default_value)