Retrieve properties of Relationship

[HOKINGLOK]

Hi all, does anyone find how to retrieve value of properties of relationships? I have defined the relationshipProperties in the graphql schema like:
type Person {
name: String!
born: Int!
actedInMovies: [Movie!]! @relationship(type: "ACTED_IN", properties: "ActedIn", direction: OUT)
directedMovies: [Movie!]! @relationship(type: "DIRECTED", direction: OUT)
}

type Movie {
title: String!
released: Int!
actors: [Person!]! @relationship(type: "ACTED_IN", properties: "ActedIn", direction: IN)
director: Person! @relationship(type: "DIRECTED", direction: IN)
}

interface ActedIn @relationshipProperties {
roles: [String!]
}
But do not know how to write query to retrieve the value of "roles".