Significant text aggregation on multiple fields

Hi
I'm using the multi_match query for search with phrase keyword,
in the aggregations, I'm using significant_text aggregation, But I can only specify one field
is there any way to perform that aggregation on multiple fields just like how we do for multi_match query.

here's my query

{
    "query": {
        "bool": {
            "must": [
                {
                    "multi_match": {
                        "query": "cryptocurrency",
                        "type": "phrase",
                        "fields": [
                            "title",
                            "description"
                        ]
                    }
                }
            ]
        }
    },
    "aggregations": {
        "keywords": {
            "significant_text": {
                "field": "title"
            }
        }
    }
}

Thanks

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