Hi Carlos,
Stefan with Carsten showed me this trick during last m68k meeting back in 2018 at Essen.
On the harddrive/cf card simply write the content of the iSO file to some partition.
You can use swap partition - only it will be rewritten during the fist actual boot of Linux.
You can do it virtually on anything which understands Amiga partitioning of that drive.
dd if=debian.iso of=/dev/sdc bs=512 status=progress
During the meeting we actual used Stefan's beautiful Falcon running Debian :)
Fire up the amiboot
During the setup there will be error as CD-ROM not detected.
Load CD-ROM drivers from removable media - YES
Manually select a CD-ROM module and device - YES
Module needed for accessing the CD-ROM: none
Device file for accessing the CD-ROM: /dev/hda2
It worked like a charm.