I don’t think so, if so, it isn’t any different from any GraphQL implementation out there.
You have specific endpoints to do so. The GraphQL queries are bind with the schema. So, if you don’t define your schema, there’s no query or mutation available.
Also, we use custom directives and other Graphql features to make it very close to GraphQL+-. You can check it out at:
https://graphql.dgraph.io/docs/
The next features includes custom GraphQL logic. Which you gonna be able to control how GraphQL queries do things.