The kana key is also the shift key in alphanumeric mode.

json

{
  "description": "Change lang1(Kana) to left_shift. (Post lang1 if pressed alone)",
  "manipulators": [
    {
      "conditions": [
        {
          "input_sources": [
            {
              "input_mode_id": "com.apple.inputmethod.Roman"
            }
          ],
          "type": "input_source_if"
        }
      ],
      "from": {
        "key_code": "lang1",
        "modifiers": {
          "optional": [
            "any"
          ]
        }
      },
      "to": [
        {
          "key_code": "left_shift"
        }
      ],
      "to_if_alone": [
        {
          "key_code": "lang1"
        }
      ],
      "type": "basic"
    }
  ]
}

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