{
   "version": "2.0.0",
   "command": "cmd",
   "args": ["/c"],
   "tasks": [
      {
         "label": "The task",
         "command": "my_batch_file.bat",
         "type": "shell",
         "args": [
            "${workspaceFolder}",
            "${input:chooseDirectory}"
         ],
         "problemMatcher": []
      }
   ],
   "inputs": [
      {
         "id": "chooseDirectory",
         "description": "Select the Directory",
         "type": "pickString",
         "options": ["option1", "${fileDirname}"],
         "default": "option1"
      }
   ]
}

> Executing task: my_batch_file.bat C:MyWorkspaceDirectory ${fileDirname} <