How to bulk upload data as form data with _id included

I Am designing a form where I am creating a country survey where i am adding country information overtime which gives me a _id every-time which I am referring to another form to sort of create a relational data. Now there are many country information’s I need to add and it is not feasible to entry these data manually. So my question is is there a way that I can bulk upload data which will automatically count as bulk submissions.

Are you creating this form in XLSForm?

yes I am. Please help me find a work around on this