Use rank feature query as multiplier to the relevance score

As per the documentation, the rank feature query score is added to the overall query score.
Since the relevance score itself is not bounded - the actual store depends on the data in your indices - how do I make the rank feature score useful?

I'm trying to use a multi match query for relevance and using rank feature query to power ranking of results. However my multi match query score usually lies in the range 8 - 14. At this range even adding rank feature query score (which is in the range 0-1) is not really helpful.

Is there any way I can multiply relevance score with rank feature query score?

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