Return field alias name instead of the actual field name in search api

I have "field_b" which is alias to "field_a". When I search it using GET method in the dev console, it return the data with "field_a" : 'some data" instead of "field_b" : "some data". Is it possible to get it to return data using "field_b"?

looks like this is somewhat possible with docvalue_fields. Not sure if there's a better solution.

"docvalue_fields": [
            "field": "field_b",
            "format": "date_time"

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