abre2@PSTNABRE2A:~$ truncate -s 1G test.img
abre2@PSTNABRE2A:~$ sudo losetup -Pf --show test.img
/dev/loop0
abre2@PSTNABRE2A:~$ sudo fdisk /dev/loop0 

Welcome to fdisk (util-linux 2.38.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Device does not contain a recognized partition table.
Created a new DOS (MBR) disklabel with disk identifier 0x6b188ba3.

Command (m for help): n
Partition type
   p   primary (0 primary, 0 extended, 4 free)
   e   extended (container for logical partitions)
Select (default p): 

Using default response p.
Partition number (1-4, default 1): 
First sector (2048-2097151, default 2048): 
Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-2097151, default 2097151): 

Created a new partition 1 of type 'Linux' and of size 1023 MiB.

Command (m for help): t 1
Selected partition 1
Hex code or alias (type L to list all): 7
Changed type of partition 'Linux' to 'HPFS/NTFS/exFAT'.

Command (m for help): p
Disk /dev/loop0: 1 GiB, 1073741824 bytes, 2097152 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x6b188ba3

Device       Boot Start     End Sectors  Size Id Type
/dev/loop0p1       2048 2097151 2095104 1023M  7 HPFS/NTFS/exFAT

Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Syncing disks.

abre2@PSTNABRE2A:~$ sudo mkfs.ext4 /dev/loop0p1 
mke2fs 1.46.6-rc1 (12-Sep-2022)
Discarding device blocks: done                            
Creating filesystem with 261888 4k blocks and 65536 inodes
Filesystem UUID: bea271ef-1c5f-4318-b672-dabdf857e7e7
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done

abre2@PSTNABRE2A:~$ sudo fdisk -l /dev/loop0
Disk /dev/loop0: 1 GiB, 1073741824 bytes, 2097152 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x6b188ba3

Device       Boot Start     End Sectors  Size Id Type
/dev/loop0p1       2048 2097151 2095104 1023M  7 HPFS/NTFS/exFAT
abre2@PSTNABRE2A:~$