How to normalize similarity score using 'more_like_this'

I'm using 'more like this' to get the similarity of the given text.
As you know, the score is not normalized.
I want to get a normalized value [0, 1] so that I can cut out documents below the threshold score.

I thought if I can get the score of the query text itself,
I could normalize it using 'matched document score/query text score'
Is there any way to get score of query text itself?
Or is there another way to normalize the similarity score?

Thanks for reading!

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