Bulk Upload by Plugin Without using Excel file

Hello, I am here new to nopComerce and want to learn bulk upload without using excel file by plugin i don't know how that would be created i recently imported many product to my local by .xslx file but now i want to upload and customize their attributes with plugin but how...if anyone know about it please look at this..Thanks

If you are a developer, then you can create your own plugin.  You can copy the import logic from \Libraries\Nop.Services\ExportImport and modify it to your needs.