Importing 'psd files with layers' using extendscript sdk not showing option to select layers

While importing PSD files (that contains multiple layers) from the extension panel in 'After effects' using 

app.project.importFile

will not provide any option to import individual layers, it always imports as merged psd.
We want to provide user option to select any of the layers in the psd file during import.


In premiere pro extension panel,
if we import the same psd file, using the following code, will give us the option to choose the layers.

app.project.importFiles