Dgraph manual reverse index is gone after each GraphQL Schema upload

We are using a GraphQL Schema and for some special cases we need reverse index to execute some custom queries but I couldn’t find a way to put this inside the GraphQL Schema and after each GraphQL Schema upload I must add this reverse index to schema manually. Is there a way to tell dgraph that a field has reverse index(I’m not talking about hasInverse):
In this example I want to have a reverse index on Movie.tags predicate.

type Movie {
  id: ID!
  name: String!
  tags: [Tag] # need something here
type Tag {
  TagID: ID!
  nameL: String!