Execution time is not showing for javascript under Sources tab in Chrome devtools

I have started the recording for my page under chrome dev tools performance tab. After I complete the recording and analyse the performance, I find that one specific javascript is take longer time. when I click on that javascript, it opens in sources tab, but not showing execution time for individual lines inside a javascript function. How to enable it?

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I have started the recording for my page under chrome dev tools performance tab. After I complete the recording and analyse the performance, I find that one specific javascript is take longer time. when I click on that javascript, it opens in sources tab, but not showing execution time for individual lines inside a javascript function. How to enable it?

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