How do I inject users according a csv file

Hello. I am new for gatling. And I have a csv file which records the number of users(or requests) per second. I want to inject specify number of users according to the csv file. How do I do this?
It would be very kind of you to help me. Thank you !

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That’s something you’ll have to code yourself: read your file and turn the entries into a list of rampUsers(n).during(1) to be passed to injectOpen.