'Is it possible to use ElasticSearch query score (_score) as part of another query's function score?

I need to make a custom score function for an Elastic Search query. Part of this score is based on another query's score

For example this query will return a _score field between 0-10

{
  "query": {
    "multi_match" : {
                "query": "someField", 
                "fields": "*" 
            }
  },
  "from": 0,
  "size": 20
}

"hits": [
            {
                "_index": "index",
                "_type": "_doc",
                "_id": "123123",
                "_score": 9.045522,
                "_source": {
                ...
                ...

What I want is to utilize this _score value as part of a new query of the following form:

{
  "query": {
    "function_score": {
      "query": {
            "multi_match" : {
                "query": "<search text>", 
                "fields": "*" 
            }
      },
      "boost": "2", 
      "functions": [
        {
          "filter": { "match": { "filterField": "filtervalue" } },
          "weight": 10
        },
        {
          <A way to use the _score and multiply it by a factor>
        }

Is this even possible?

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'Is it possible to use ElasticSearch query score (_score) as part of another query's function score?

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