.karabiner.d/configuration/karabiner.json

karabiner.json

{
    "profiles": [
        {
            "name": "Default profile",
            "selected": true,
            "simple_modifications": {
                "keypad_1": "end",
                "keypad_3": "page_down",
                "keypad_7": "home",
                "keypad_9": "page_up",
                "keypad_4": "left_arrow",
                "keypad_6": "right_arrow",
                "keypad_8": "up_arrow",
                "keypad_2": "down_arrow",
                "left_alt": "left_gui",
                "left_gui": "left_alt",
                "keypad_0": "insert",
                "keypad_period": "delete_forward"
            }
        }
    ]
}