Karabiner-Elements Remap capslock to control-option-7

gistfile1.txt

{
  "title": "Change caps_lock key to control-option-7",
  "rules": [
    {
      "description": "Change caps_lock key to control-option-7",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "key_code": "caps_lock"
          },
          "to": [
            {
              "repeat": false,
              "key_code": "7",
              "modifiers": [
                "left_alt",
                "left_control"
              ]
            }
          ]
        }
      ]
    }
  ]
}