to mount image from clonezilla to retrieve single file you can use

cat /media/u/4TB_WD/backup/2019-10-18-14-img-xps-raw/ubuntu-vg-root.ext4-ptcl-img.gz.* | gzip -d -c |  partclone.restore -W -o 2019_10_18.img -L partclone.log


sudo mount -o loop -t ext4 /media/u/4TB_WD/backup/2019_10_18.img /mnt