The graph, filter query by relationship non id value

Question

I have these types:

    type Poll @entity {
        id: ID!
        hash: String!
        contributions: [Contribution!]! @derivedFrom(field: "poll")
    }
type Contribution @entity {
    id: ID!
    contributorAddress: Bytes!
    poll: Poll!
}

I need to query a poll filtered by the contribution contributorAddress but it seems that I'm only able to do it with the contribution ID.

Here are the mappings:

    poll.contributions = new Array<string>(0)
let contributions = poll.contributions
contributions.push(contribution.id)
poll.contributions = contributions

Thanks