Karabiner-Elements rule to insert backtick/backquote with a single keystroke

add-this-rule-in-karabiner.json

{
  "description": "Insert backquote in one swift stroke.",
  "manipulators": [
    {
      "conditions": {
        "input_sources": [
          {
            "input_source_id": "^com\\.apple\\.keylayout\\.Spanish-ISO$"
          }
        ],
        "type": "input_source_if"
      },
      "from": {
        "key_code": "open_bracket"
      },
      "to": [
        {
          "key_code": "open_bracket"
        },
        {
          "key_code": "spacebar"
        }
      ],
      "type": "basic"
    }
  ]
}