how to access request / response time stamp for service callout policy

Hi, all

Is there a way to access time stamp in milliseconds for request start and response end from service callout policy ?

I need to log for these information after executing service callout policy, but service callout policy doc, there is no variable available that I can access.

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@Sungho.Maeung2 , Please find similar question asked here. Feel free to comment here if you think this is not a duplicate question of the one mentioned above so that we can reopen same.