What's the optimal way to store contacts or large lists worth of data?

Hi I'm interested in learning if there are any clever or simplified ways to store large lists of data.

One example is I'm working with storing a user's contacts and on mobile you receive a list of objects. If I'm looking to store each of these from a mobile app, would I need to make each node via its own network call? Or is there a way to upload an array and then provide instructions to access the array, thus making one network call?

I'm using neo4j-graphql-js but I guess I'm wondering in general if something like that could work