To build your own manjaro arm image find below the wiki
build images are save here :
/var/cache/manjaro-arm-tools/img/
to add or remove some packages from the edition you build edit the file
/usr/share/manjaro-arm-tools/profiles/arm-profiles/editions/
my command to build an image is looking so
sudo buildarmimg -d om1 -e kde-plasma -v 2024.02.29 -b stable n
in your case use this command for example
sudo buildarmimg -d on2-plus -e kde-plasma -v 2024.02.29 -b stable n
to my knowledge manjaro is the only arm distro to provide a user build image tool…
same possibility for the manjaro x86, when it works :-/
no problem if you need help to build one for arm.