Karabiner-Elements - change fn + i/j/k/l to arrows

Karabiner Diamond Arrows

// Adapted from https://pqrs.org/osx/karabiner/complex_modifications/json/vi_style_arrows3.json
// 1. vim ~/.config/karabiner/karabiner.json
// 2. Enter the below in complex modifications array
// 3. Check it's enabled inside karabiner UI.

{
  "title": "Diamond arrows",
  "rules": [
    {
      "description": "Change Function+i/j/k/l to Arrows",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "key_code": "j",
            "modifiers": {
              "mandatory": [
                "fn"
              ],
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "left_arrow"
            }
          ]
        },
        {
          "type": "basic",
          "from": {
            "key_code": "k",
            "modifiers": {
              "mandatory": [
                "fn"
              ],
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "down_arrow"
            }
          ]
        },
        {
          "type": "basic",
          "from": {
            "key_code": "i",
            "modifiers": {
              "mandatory": [
                "fn"
              ],
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "up_arrow"
            }
          ]
        },
        {
          "type": "basic",
          "from": {
            "key_code": "l",
            "modifiers": {
              "mandatory": [
                "fn"
              ],
              "optional": ["any"]
            }
          },
          "to": [
            {
              "key_code": "right_arrow"
            }
          ]
        }
      ]
    }
  ]
}