control + h to delete_or_backspace

gistfile1.txt

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