What is the normal actual storage capacity for a 1TB fusion drive?

Hi

After a failed windows installation using the bootcamp assistant, I have set the partition back to just one again. Now I would like to try to install again, but it seems to me like I'm missing a lot of space after this.

Not entirely sure what is normal here, but I have a 1TB fusion drive (2018 iMac). It shows correctly under Fusion drive in Disk Utility:

However, when I click into the only child drive, it shows only 774GB. I understand that the system takes some space too, but I was just a bit surprised that it takes as much as 226 GB. Is this normal? If it is, then there is no issue. I just want to make sure there is no "lost disk space" floating around after the failed Bootcamp partitioning.

This is what diskutil list gives me:

/dev/disk0 (internal, physical):

  #:            TYPE NAME          SIZE    IDENTIFIER

  0:   GUID_partition_scheme            *1.0 TB   disk0

  1:            EFI EFI           209.7 MB  disk0s1

  2:         Apple_APFS Container disk2     746.3 GB  disk0s2

/dev/disk1 (internal, physical):

  #:            TYPE NAME          SIZE    IDENTIFIER

  0:   GUID_partition_scheme            *28.0 GB  disk1

  1:            EFI EFI           314.6 MB  disk1s1

  2:         Apple_APFS Container disk2     27.7 GB  disk1s2

/dev/disk2 (synthesized):

  #:            TYPE NAME          SIZE    IDENTIFIER

  0:   APFS Container Scheme -           +774.0 GB  disk2

                 Physical Stores disk1s2, disk0s2

  1:        APFS Volume Macintosh HD - Data   385.9 GB  disk2s1

  2:        APFS Volume Preboot         83.0 MB  disk2s2

  3:        APFS Volume Recovery        528.5 MB  disk2s3

  4:        APFS Volume VM           2.2 GB   disk2s4

  5:        APFS Volume Macintosh HD      11.0 GB  disk2s5

(or as image: )

Any qualified feedback appreciated.