Hold a Key - Shortcut for Photoshop.json

{ "title": "Rules for Karabiner-Elements | Tested Version: 12.10.0",
  "rules": [
     { "description": "Hold a Key - Shortcut for Photoshop",
       "manipulators": [
        {"from": { "key_code": "a" },
        "parameters": {"basic.to_if_alone_timeout_milliseconds": 300,
        "basic.to_if_held_down_threshold_milliseconds": 500},
        "to_if_alone": [
        {"key_code": "a"}],
          "to_if_held_down":[
                 {
"shell_command": "osascript -e 'run script \"Replace_Me\"'"
}],
          "type": "basic",
    "conditions": [
        {
            "type": "frontmost_application_if",
            "bundle_identifiers": [
                "^com\\.adobe\\.Photoshop$"
            ]
        }
    ]
                }
            ]
        }
    ]
}