Please go through this blog to upload GSTR-1 JSON file on GST portal :
https://getswipe.in/blog/post/how-to-upload-gstr-1-json-file-on-gst-portal
Please go through this blog to upload GSTR-1 JSON file on GST portal :
https://getswipe.in/blog/post/how-to-upload-gstr-1-json-file-on-gst-portal