Karabiner-elements: Remapping Underscore (ろ) key on Japanese keyboards

[amity]

I have it set up correctly to my keyboard, and have remapped the keys to switch between English and Kana, etc. However, it doesn't currently seem possible to rebind the underscore key (bottom right, between forward slash and right Shift). Typing it in Simple Modifications simply defaults to the 0 key, and manually editing karabiner.json to remap from '_' doesn't work either.

[jnakanojp]

"ろ" key is listed as "international1". With my Macbook Pro's internal keyboard and setting simple modification that changes international1 to a, I confirmed that typing "ろ" is acting as typing "a".
You can check the name of language specific key with Karabiner's EventViewer.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[spring-haru]

The following code works for me.

    {
      "description": "「ろ」(Underscore) -> Backslash",
      "manipulators": [
        {
          "type": "basic",
          "from": {
                    "key_code": "international1",
                    "modifiers": { "mandatory": [  ] }
                },
          "to": [
                    {
                    "key_code": "international3",
                    "modifiers": [ "left_option" ] 
                    }
              ]
        }
      ]
    },

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.