[Bug 262379] zfs module parameter zfs_max_missing_tvds isn't accessible via sysctl?

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262379

            Bug ID: 262379
           Summary: zfs module parameter zfs_max_missing_tvds isn't
                    accessible via sysctl?
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: risner@stdio.com

I'm building a system with limited redundancy consisting of a raidz1 array 18
TB drives holding ephemeral data (not backed up) and a mirrored special vdev on
SSD for metadata and smaller files (being backed up).

In my research I hoped to use zfs_max_missing_tvds=2 and mount read-only to
copy the small files to a new pool and destroy the ephemeral data?

It looks like there is no way to enable this option in FreeBSD, yet it is
covered in man zfs-module-parameters? Linux has it accessible via the /sys
filesystem.

Is there a reason it's not something that can be set from sysctl or
/boot/loader.conf?

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