Posted as a discussion upstream: https://github.com/linux-nvme/nvme-cli/issues/2886

Changing the JSON output structure may be perceived as an ABI break as often parsed in the scripts.

Until the question is answered upstream and agreed upon for RHEL, this ticket should serve as a blocker for the nvme-cli-2.15 rebase in RHEL 10.2 and 9.8.
Fixed upstream, will be picked either with the nvme-cli-2.16 rebase or needs to be picked up manually.