Karabiner-Elements for 3rd-party Keyboards

karabiner.json

{
    "profiles": [
        {
            "name": "Default profile",
            "selected": true,
            "simple_modifications": {
                "left_command" : "left_option",
                "left_option" : "left_command",
                "right_command" : "right_option",
                "right_option" : "right_command"
            },
            "fn_function_keys": {
                "f1":  "vk_consumer_brightness_down",
                "f2":  "vk_consumer_brightness_up",
                "f3":  "vk_mission_control",
                "f4":  "vk_launchpad",
                "f5":  "vk_consumer_illumination_down",
                "f6":  "vk_consumer_illumination_up",
                "f7":  "vk_consumer_previous",
                "f8":  "vk_consumer_play",
                "f9":  "vk_consumer_next",
                "f10": "mute",
                "f11": "volume_down",
                "f12": "volume_up"
            }
        }
    ]
}