GraphQL Admin API Schema Connection to Postman for Autocompleting

[ZVNDEV]

I am currently running Shopify Admin API queries in Postman.  I know that it is possible to connect a graphql schema to postman, so that you can gain graphql autocompletion when writing mutations/queries based on the schema. 
How can I connect to Shopify's Admin API GraphQL schema within postman?

For example, in Shopify's graphiQL interface, you can use control+space-bar to show all available fields on an object.  This would be very handy in Postman, and I believe this feature is fundamental to GraphQL - so I'm likely missing something simple here.

Thanks!