Is it possible to delete the fusion drives' standard partitions to be able to use the SSD part only for the OS?

Like the question suggests, I'm thinking about purchasing one of the new 27'' iMacs and I'm wondering if I'd be possible to repartition the 3TB fusion drive to use the 128GB SSD part only for the OS.

Thanks a lot for this fast and helpful reply!
€dit: I accidentially clicked on "This helped me" instead of "This solved my question" and now it seems like I'm unable to change that :/

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