Karabiner Elements - Change Fn + hjkl to arrows

gistfile1.txt

{
    "description": "Change Fn + h/j/k/l to Arrows",
    "manipulators": [
        {
            "from": {
                "key_code": "h",
                "modifiers": {
                    "mandatory": ["fn"],
                    "optional": ["caps_lock"]
                }
            },
            "to": [{ "key_code": "left_arrow" }],
            "type": "basic"
        },
        {
            "from": {
                "key_code": "j",
                "modifiers": {
                    "mandatory": ["fn"],
                    "optional": ["caps_lock"]
                }
            },
            "to": [{ "key_code": "down_arrow" }],
            "type": "basic"
        },
        {
            "from": {
                "key_code": "k",
                "modifiers": {
                    "mandatory": ["fn"],
                    "optional": ["caps_lock"]
                }
            },
            "to": [{ "key_code": "up_arrow" }],
            "type": "basic"
        },
        {
            "from": {
                "key_code": "l",
                "modifiers": {
                    "mandatory": ["fn"],
                    "optional": ["caps_lock"]
                }
            },
            "to": [{ "key_code": "right_arrow" }],
            "type": "basic"
        }
    ]
}