How to fetch the page response time in a java script variable

Hello

I am looking for a way to get and store the response time of a page (or) a particular request in the page to a variable .

The response time is not present in the response header , so I can not use a variable extractor and store it in a variable .

1) Is there a built-in way to get this response time and store it in a variable , so I can log them and do what I want to do with it ..
2) is there a java script way to fetch this indirectly or so ?

I am sure , there should be a way as NeoLoad has this data of response time already in its hand which shows in the final report , also we have the validation check if response duration is shorter than what we specify etc.

Please let me know

Thanks & Warm Regards
Musaffir