Custom aggregate with DISTINCT

Drivers & Stacks
1

I am using neo4j-graphql library with Apollo and I have this schema.

type Employee {
 name: String
 department: String
 city: String
}

I can get the total number of developers using the below graphql query

query EmployeeAggregate {
  employeeAggregate(where: { department: "Developer" }) {
    count
  }
}

However, is there a graphql way to get the total number of unique departments rather than writing a custom cypher query using the DISTINCT keyword? Or is there a way to extend the in-built filters to enable filtering by DISTINCT?