This complicated modification ought to work:

{
  "description": "alt + semicolon to ? ukrainian and english keyboards",
  "manipulators": (
    {
      "sort": "fundamental",
      "circumstances": (
        {
          "input_sources": (
            {
              "language": "en"
            }
          ),
          "sort": "input_source_if"
        }
      ),
      "from": {
        "key_code": "semicolon",
        "modifiers": {
          "obligatory": (
            "right_option"
          ),
          "optionally available": ("any")
        }
      },
      "to": (
        {
          "key_code": "slash",
          "modifiers": ("left_shift")
        }
      )
    },
    {
      "sort": "fundamental",
      "circumstances": (
        {
          "input_sources": (
            {
              "language": "uk"
            }
          ),
          "sort": "input_source_if"
        }
      ),
      "from": {
        "key_code": "semicolon",
        "modifiers": {
          "obligatory": (
            "right_option"
          ),
          "optionally available": ("any")
        }
      },
      "to": (
        {
          "key_code": "7",
          "modifiers": ("left_shift")
        }
      )
    }
  )
}

It is laborious to supply insightful assist as a result of you have not included your try within the query; I can not level out what you will have misunderstood. Having this working instance ought to assist you put the items collectively although.

The

"to": (
  {
    "key_code": "7",
    "modifiers": ("left_shift")
  }
)

elements could have to be up to date to output query marks on your keyboard.

Go to System Preferences > Keyboard > Enter Sources, choose the enter supply you wish to output a query mark for, after which press modifier keys like shift, alt, till you see the place the query mark lives.

It’s possible you’ll wish to additional specify the input_source_if situation too. They’re objects with the properties:

{
  "input_sources": (
    {
      "language": "^en$",
      "input_source_id": "^com.apple.keylayout.US$",
      "input_mode_id": "^com.apple.inputmethod.Japanese.Hiragana$"
    }
  ),
  "sort": "input_source_if"
}

All properties are optionally available. Specified within the carbine docs and reproduced for reference her:

You will get your input_source_id and input_mode_id from Karabiner-EventViewer’s Variables tab. input_mode_id will not at all times exist for all enter sources.