How to configure a plugin which runs a command which needs to write to package directory

Using Swift
1

My executable needs to write to a package folder.
Is it possible to configure a package with plugins which can write to a package folder?

Consider the following:

targets: [
  .executableTarget(
    name: "MyExec"
  ),
  .plugin(
    name: "MyPlugin",
    dependencies: [
      target(name: "MyExec")
    ]
  )
  .target(
    name: "ResultTarget",
    dependencies: [],
    plugins: [
      .plugin(name: "MyPlugin")
    ]
  )
]

MyExec will write files to package folder.
Is it possible to acquire a permission for it?