Karabiner complex mapping to set Control_L to Esc when tapped, or Control when held

ctrl-esc-karabiner.json

{
    "title": "Control_L to Esc when tapped",
    "rules": [
        {
            "description": "Control_L to Esc when tapped, Control when held.",
            "manipulators": [
                {
                    "type": "basic",
                    "from": {
                        "key_code": "left_control",
                        "modifiers": {
                            "optional": [
                                "any"
                            ]
                        }
                    },
                    "to": [
                        {
                            "key_code": "left_control",
                            "lazy": true
                        }
                    ],
                    "to_if_alone": [
                        {
                            "key_code": "escape"
                        }
                    ]
                }
            ]
        }
    ]
}