I think I am confused with [RelationshipFilter](https://buf.build/authzed/api/docs/main:authzed.api.v1#authzed.api.v1.RelationshipFilter)

chart:1#viewer@group:1
chart:2#viewer@group:1
chart:3#viewer@group:1
chart:4#viewer@group:1

protobuf
// imaginary syntax for protobuf
DeleteRelationshipsRequest {
  relationship_filter: RelationshipFilter {
    resource_type: "chart",
    optional_resource_id: ??????????,
    optional_relation: "viewer",
    optional_subject_filter: SubjectFilter {
      subject_type: "group",
      optional_subject_id: "1", 
    }
  }
}

How do I specify [1, 2, 3, 4] in

optional_resource_id

?