Indeed but what would it be ?We not even know if there will be a "land and naval one" or just one of them?
If we look at the possibility of carrier use, the hook can be where the groove is.
Or we could see the position of the hook moved forward too, a bit like the old Cutlass naval fighter, it have a bit the same wing look. The groove would remain in that case but hook position could impede the weapon bay.
For the hook position lovers... the Cutlass prototype had an internal hook on the rear top of the airframe :
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