karabiner.json

{
    "title": "caps_lock to command+control+option (mix1009)",
    "rules": [
        {
            "manipulators": [
                {
                    "description": "Change caps_lock to command+control+option.",
                    "from": {
                        "key_code": "caps_lock",
                        "modifiers": {
                            "optional": [
                                "any"
                            ]
                        }
                    },
                    "to": [
                        {
                            "key_code": "right_command",
                            "modifiers": [
                                "right_control",
                                "right_option"
                            ]
                        }
                    ],
                    "type": "basic"
                }
            ]
        },
        {
            "description": "Change caps_lock to command+control+option. (Post escape key when pressed alone)",
            "manipulators": [
                {
                    "type": "basic",
                    "from": {
                        "key_code": "caps_lock",
                        "modifiers": {
                            "optional": [
                                "any"
                            ]
                        }
                    },
                    "to": [
                        {
                            "key_code": "right_command",
                            "modifiers": [
                                "right_control",
                                "right_option"
                            ]
                        }
                    ],
                    "to_if_alone": [
                        {
                            "key_code": "escape"
                        }
                    ]
                }
            ]
        }
    ]
}