ZFS attach disk to raidz1 "feature raidz_expansion unsupported by kernel"

As you probably know ZFS supports attaching a new disk to an existing raidz1 vdev since autoumn 2023. A feature flag named "raidz_epansion" must be enabled. see pull request ZFS on Github. Truenas already supports the expansion already officially. Therefore it should be stable.

I tried to set this flag on Proxmox because I want to add a new disk to a 3-disk raidz1. I get the error message: cannot set property for 'pool': feature 'raidz_expansion' unsupported by kernel.

Is it possible...

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