Rebind backspace: Command + h (Karabiner)

gistfile1.txt

{
    "description": "Backspace: Command + h",
    "manipulators": [
        {
            "from": {
                "key_code": "h",
                "modifiers": {
                    "mandatory": [
                        "command"
                    ],
                    "optional": [
                        "any"
                    ]
                }
            },
            "to": [
                {
                    "key_code": "delete_or_backspace"
                }
            ],
            "type": "basic"
        }
    ]
}