def set_bookmark_children(json_root_object, bookmarks):

    """ Sets bookmarks as value for 'children' key entry of a root bookmark

    :param json_root_object:    First (root) bookmark entry of a dict
    :param bookmarks:           The children list [{}, {},...] of dictionaries for root's 'children' key
    :return:                    The root bookmark entry with filled 'children' key
    """

    json_root_object["children"] = bookmarks

    return json_root_object