Remap the home and end keys in macOS using Karabiner Elements

karabiner-rules.json

{
  "rules": [
    {
      "description": "change home key to command + left_arrow",
      "manipulators": [
        {
          "from": {
            "key_code": "home"
          },
          "to": [
            {
              "key_code": "left_arrow",
              "modifiers": [
                "left_command"
              ]
            }
          ],
          "type": "basic"
        }
      ]
    },
    {
      "description": "change home key to command + left_arrow while presing shift (selection)",
      "manipulators": [
        {
          "from": {
            "key_code": "home",
            "modifiers": {
              "mandatory": [
                "left_shift"
              ]
            }
          },
          "to": [
            {
              "key_code": "left_arrow",
              "modifiers": [
                "left_command",
                "left_shift"
              ]
            }
          ],
          "type": "basic"
        }
      ]
    },
    {
      "description": "change end key to command + right_arrow",
      "manipulators": [
        {
          "from": {
            "key_code": "end"
          },
          "to": [
            {
              "key_code": "right_arrow",
              "modifiers": [
                "left_command"
              ]
            }
          ],
          "type": "basic"
        }
      ]
    },
    {
      "description": "change end key to command + right_arrow while presing shift (selection)",
      "manipulators": [
        {
          "from": {
            "key_code": "end",
            "modifiers": {
              "mandatory": [
                "left_shift"
              ]
            }
          },
          "to": [
            {
              "key_code": "right_arrow",
              "modifiers": [
                "left_command",
                "left_shift"
              ]
            }
          ],
          "type": "basic"
        }
      ]
    }
  ]
}

This does not seem to work in version 15.0