input source.json

{ "title": "input source",
  "rules": [
     { "description": "input source",
       "manipulators": [
        {"from": { "key_code": "a" },
        "parameters": {"basic.to_if_alone_timeout_milliseconds": 300},
        "to_if_alone": [{"key_code": "8"},
{"key_code": "9"},
{"key_code": "0"}],         
          "type": "basic",
      "conditions": [
        {
          "type": "input_source_if",
          "input_sources": [
            {
              "input_source_id": "com.apple.keylayout.Arabic-NorthAfrica"
            }
          ]
        }
      ]
      

                }
            ]
        }
    ]
}