Not sure about your question. But the work “elapsed” means “elapsed time”, it is just a time count.
I know that we have several code spread across repositories. This one is an example of code benchmarks/convert/main.go at master · dgraph-io/benchmarks · GitHub But I guess this converts from CVS to RDF. Or from a custom dataset(From Google) to RDF.
You can create your own code for this case based on that principles in that code.