Driver to match children visibility from their parent

Hi everyone,

the following script allows to match the children visibility of the children from their parent’s.
It creates a driver that can also be copy pasted;

I would like to use this driver without having to run the script when I open a file.

Is there a way to do so?

import bpy

from import driver_namespace as dns

def test(self, dg):
    vl = dg.view_layer
    return not self.parent.original.visible_get(view_layer=vl)
dns["test"] = test
context = bpy.context
scene = context.scene
#parented objects
parented = [o for o in scene.objects if o.parent]

for o in parented:
    #o.animation_data_clear() # testing
    fcurve = o.driver_add("hide_viewport")
    driver = fcurve.driver
    driver.expression = "test(self, depsgraph)"
    driver.use_self = True
    # dummy var to make driver update.
    var = = "dummy" # frame
    var.targets[0].id_type = 'SCENE'
    var.targets[0].id = scene
    var.targets[0].data_path = "frame_current"