Mount software RAID volumes - overcome unknown filesystem type 'linux_raid_member'

This error typically occurs when you are trying to mount a partition which is a part of software RAID.

First - get all partitions:

lsblk

Then - assemble the RAID:

mdadm --assemble --run /dev/md0 /dev/nvme0n1p2 /dev/nvme1n1p2

Finally - mount:

mount /dev/md0 /mnt/