Hi @dipeshlshah,
Not very familiar with postman-to-k6 , but the k6 cloud currently (it will change but there will be * 
) doesn’t support running just iterations in it. The currently supported options are using stages or duration + vus (which is mostly a single stage with the same starting vus as the stage one).
If I understood you correctly you want to do 1 iteration per 1 line of that json and no more? Do you want the iterations to be in parallel or do you want them sequential?
You can read this post by @mark on how to use data only once in a test and still be able to use stages.