This seems like it was fairly comprehensively answered already:
RHEL 8 doesn't support btrfs.

However about XFS, we are in fact going to backport the two missing
features (bigtime and inobtcnt) to RHEL 8.  The bugs are unfortunately
private but for reference they are:

https://bugzilla.redhat.com/show_bug.cgi?id=2022903
https://bugzilla.redhat.com/show_bug.cgi?id=2024201

Note that this will allow you to open RHEL 9 / Fedora 35 XFS
filesystems in RHEL 8, but maybe not create them from scratch using
RHEL 8 tools like mkfs.xfs.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v
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