Get a group from layerTreeRoot using its unique id using PyQGIS

Question

I am having trouble when loading some layers in QGIS. I want to place them in specific groups and sub-groups but a problem occurs when multiple groups and sub-groups have the same name. The only way I can retrieve a group or a sub-group is by using its name:

root = QgsProject.instance().layerTreeRoot()
group = root.findGroup('group_name')
group.insertLayer(0, layer)

Is there a way to retrieve a group or a sub-group using a unique identifier? If you create these groups in QGIS:

and execute the following code in the python console you will see that QGIS always places the layer under the first group it finds to have that name.

root = QgsProject.instance().layerTreeRoot()
group = root.findGroup('group A')
uri = "point?crs=epsg:4326&field=id:integer"
layer = QgsVectorLayer(uri, "Scratch point layer", "memory")
QgsProject.instance().addMapLayer(layer, False)
group.insertLayer(0, layer)

but instead, I want to place it here:

Answer 1

I've written a script to access easily to layer(s) and group(s) in QGIS Layer Panel.

Here's the group part:

def G(group_path: str = None):
    """
    Return the group given in path
    If group_path is None, returns root
    """

    group = QgsProject.instance().layerTreeRoot()

    if group_path:
        groups =  group_path.strip("/").split('/')
        for g in groups:
            group = group.findGroup(g)
            if not group:
                raise Exception(f"Not found")

    return group


layer = QgsVectorLayer('None', "layer", "memory")

group = G('group B/group A')
group.addLayer(layer)