Session flash in AfterImport Laravel Excel

Hi, i am using Laravel excel 3.1 on my Inertia vue project. I am creating import function for big file using chunksize, shouldqueue and withevent. Everything work fine now, but i need to tell the user ( frontend ) that the import process already finished. How to do that? I try using flash, session, return redirect. Everyting failed.

here are my code :

class ProductsImport implements
    ToModel,
    WithHeadingRow,
    WithChunkReading,
    WithValidation,
    ShouldQueue,
    WithEvents,
    SkipsOnError,
    SkipsOnFailure
{
    use Importable, SkipsErrors, SkipsFailures, RegistersEventListeners;

    public function __construct()
    {
    }

    public function model(array $row)
    {
       // My code to store to db
    }

    public function rules(): array
    {
      // rules
    }

    public function chunkSize(): int
    {
        return 50;
    }

    public static function afterImport(AfterImport $event)
    {
			Log::info('Import Finish!)
        // Here is what i want to type to tell user that the process already finished. how to do that?	        
    }
}

Here are what i already tried :

	using return redirect()->back()->withSuccess('Imported Finish');
	or 
	Session::flash('success', 'Imported Finish');
	or event 
	i try to return route('xxxxxxx')