Can I get the last survey score and put in on a contact field ?

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I created a survey for scoring the behavior of a contact and put this survey on the contact page in one of the tabs (survey by proxy)

What I want to do is, when the agent finishes the survey, I want to get the score and put the score value in a field under contact.

Under end of survey options, there is an update field value option. I can select the field that I want to update but it gets only absolute values, I can't set the new score of the survey.

Is there a way to update the contact record field with the latest survey score ?