How to install apt packages into mounted system image (img file)

I need to edit/prepare debian-based Raspbian system image for multiple Raspberry Pi devices. Until now, my modifications consisted in adding or changing existing config files. I wrote script like this (to mount partitions from img file): IMGFILE='edited-raspbian.img' MNTDIR='/mnt/'$IMGFILE'/' LOOPDEVICE=$(sudo losetup -f) sudo losetup -P $LOOPDEVICE $IMGFILE PARTITIONS=$(sudo fdisk -l $LOOPDEVICE | grep $LOOPDEVICE'*p' | cut -d$' ' -f 1 | cut -d$'/' -f 3) while IFS= read -r PARTITION; do MNTDIRPART=$MNTDIR'/'${PARTITION: -2} sudo mkdir -p $MNTDIRPART sudo mount "/dev/$PARTITION" "$MNTDIRPART" done <<< "$PARTITIONS" After I run it I see and edit '/' and '/boot' partitions from image in directories: /mnt/edited-raspbian.img/p1 /mnt/edited-raspbian.img/p2 --- My question is: How can I install apt packages "into image"? Can I just chroot to directory, where image / partition is mounted and run apt install? To simplify everything I can work on Raspberry Pi with Raspbian (normally I'm editing these images on latest Debian).