Extract single file from command line from device on Linux

[mdadm]

I know how to view directories and files on device by command run as root: "7zz l /dev/sda | less", but how to extract from command line single file or directory containing file(s) from device with filesystem supported by 7-zip (like ext4) but which can not mounted on Linux?

[Igor Pavlov]

I don't understand that question.
Extracting command:

7z x /dev/sda folder/file

[mdadm]

Nevermind: I found solution what I was looking for:

7z l /dev/sdb1 | less
7z e /dev/sdb1 '-ir!dir/file'
7z e /dev/sdb1 '-ir!dir/*'

/dev/sdb1 is not mounted! I wonder if it works for APFS, but I won't check - I don't have disk with that fs.

Update:
Ok, this also works and is simplier:

7z e /dev/sdb1 'dir/file'
7z e /dev/sdb1 'dir/*'

Thanks Igor for your effort!