Is cross-collection search supported on OpenSearch Serverless?

We use the cross-domain search functionality in Opensearch domains, which allows us to create connections between domains and use the Opensearch cross-cluster search feature to execute a single query with results returned from each domain. https://docs.aws.amazon.com/opensearch-service/latest/developerguide/cross-cluster-search.html

Then we could run queries (with aggregations) against multiple domains by including comma separated connection aliases in the index name ("connection-alias:index" as each remote index name):

    GET https://a-domain.us-east-1.es.amazonaws.com/a_index,cluster_a_to_b:b_index,cluster_a_to_c:c_index/_search
    {
      "query": {
        "match": {
          "user": "domino"
        }
      }
    }

Is there an equivalent feature in Serverless that lets you search across multiple "collection" indexes with a single query? https://opensearch.org/docs/latest/security/access-control/cross-cluster-search/

Could we use multiple collection name aliases the same way instead of the domain connection aliases?