How to do Filings for GSTR-1 and GSTR-3B from ERPNext to GST portal

How to do Filings for GSTR-1 and GSTR-3B from ERPNext to GST portal .PLZ share the steps for this and also is json format is correct to upload in GST portal. Did any one tried uploading JSON files from india compliance in GST portal ?

You can download json using the following steps and upload it to GST Portal: