Karabiner-Elements config: Change left_option + hjklnp to arrow karabiner://karabiner/assets/complex_modifications/import?url=https://gist.githubusercontent.com/jackytang/3713974a2c9870830438f3426d6e0cf8/raw/4f4bea826ac0464eca4b4dbc1b2d7f70a7897124/karabiner_opgion_hjklnp_to_arrow.json

karabiner_option_hjklnp_to_arrow.json

{
  "title": "Change left_option (⌥) + hjklnp to arrow for HHKB",
  "rules": [
    {
      "description": "Change left_option (⌥) + hjklnp to arrow for HHKB",
      "manipulators": [
        {
          "from": {
            "key_code": "h",
            "modifiers": {
              "mandatory": [
                "left_option"
              ]
            }
          },
          "to": [
            {
              "key_code": "left_arrow"
            }
          ],
          "type": "basic"
        },
        {
          "from": {
            "key_code": "l",
            "modifiers": {
              "mandatory": [
                "left_option"
              ]
            }
          },
          "to": [
            {
              "key_code": "right_arrow"
            }
          ],
          "type": "basic"
        },
        {
          "from": {
            "key_code": "j",
            "modifiers": {
              "mandatory": [
                "left_option"
              ]
            }
          },
          "to": [
            {
              "key_code": "down_arrow"
            }
          ],
          "type": "basic"
        },
        {
          "from": {
            "key_code": "k",
            "modifiers": {
              "mandatory": [
                "left_option"
              ]
            }
          },
          "to": [
            {
              "key_code": "up_arrow"
            }
          ],
          "type": "basic"
        },
        {
          "from": {
            "key_code": "a",
            "modifiers": {
              "mandatory": [
                "left_option"
              ]
            }
          },
          "to": [
            {
              "key_code": "home"
            }
          ],
          "type": "basic"
        },
        {
          "from": {
            "key_code": "e",
            "modifiers": {
              "mandatory": [
                "left_option"
              ]
            }
          },
          "to": [
            {
              "key_code": "end"
            }
          ],
          "type": "basic"
        },
        {
          "from": {
            "key_code": "p",
            "modifiers": {
              "mandatory": [
                "left_option"
              ]
            }
          },
          "to": [
            {
              "key_code": "page_up"
            }
          ],
          "type": "basic"
        },
        {
          "from": {
            "key_code": "n",
            "modifiers": {
              "mandatory": [
                "left_option"
              ]
            }
          },
          "to": [
            {
              "key_code": "page_down"
            }
          ],
          "type": "basic"
        },
        {
          "from": {
            "key_code": "open_bracket",
            "modifiers": {
              "mandatory": [
                "left_option"
              ]
            }
          },
          "to": [
            {
              "key_code": "page_up"
            }
          ],
          "type": "basic"
        },
        {
          "from": {
            "key_code": "close_bracket",
            "modifiers": {
              "mandatory": [
                "left_option"
              ]
            }
          },
          "to": [
            {
              "key_code": "page_down"
            }
          ],
          "type": "basic"
        }
      ]
    }
  ]
}