Is there a way to combine filter aggs as sub aggs?

Question

I'm trying to create aggregations for certain matches.

GET /test_index_search
{
  "aggregations": {
    "fooAggregation": {
      "filters": {
        "filters": {
          "mu-custom-foo-agg": {
            "bool": {
              // my boolean query that searcher for `foo` matches
            }
          }
        }
      }
    },
    "barAggregation": {
      "filters": {
        "filters": {
          "mu-custom-bar-agg": {
            "bool": {
              // my boolean query that searcher for `bar` matches
            }
          }
        }
      }
    }
  }
}

The aggregation results that I receive are quite fine. But I'd like to combine them as sub-aggregations for convenience.

The only thing that I've found out - Elasticsearch supports Composite aggregations link, but CompositeSources, used as composite aggregation items do not use filter queries.

Is there any other way just to combine them into a single aggregation?