Get function score value as fields

Hi,

I'm looking for the equivalent of this Solr feature which allows me to get a function score value as a pseudo-field. I don't see anything similar in the documentation...
Perhaps it's possible to call custom function score queries in script_fields? If so, how? Again I don't see anything about this in the docs.
Without this feature I'd be forced to parse the explanation tree which is cumbersome, error-prone and slow.

Thanks,
Mauricio

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