May I ask how to speed up the verification speed through multi-threading

I have a brand new batch of 7.68T u.2 SSDs here and want to test whether writing data with theoretical cycle life times under server room temperature conditions will produce failures.
When I enable only one f3write&f3read, even though the drive has a theoretical write speed of 7GB/S, the actual drive write speed is only 1GB/s due to the CPU single core main frequency not being high enough.
I might even have to test it for a year if I go at that speed.
If I use fio I can use the -thread -numjobs parameter, but how do I use f3write & f3read to achieve multi-threading?