my karabiner rules https://karabiner-elements.pqrs.org/

my-karabiner-rules.json

{
  "title": "my rules",
  "rules": [
    {
      "description": "Maps F6 to Clipboard Screenshot",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "key_code": "f6"
          },
          "to": [
            {
              "key_code": "4",
              "modifiers": ["left_command", "left_control", "left_shift"]
            }
          ]
        }
      ]
    },
    {
      "description": "maccy fn v",
      "manipulators": [
        {
          "type": "basic",

          "from": {
            "key_code": "v",
            "modifiers": {
              "mandatory": ["fn"]
            }
          },

          "to": [
            {
              "key_code": "v",
              "modifiers": ["left_command", "left_shift"]
            }
          ]
        }
      ]
    }
  ]
}