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First create a repo file in CentOS:

===> cat /etc/yum.repos.d/opensuse-leap-15.3.repo 
[opensuse-leap-15.3]
name=OpenSUSE Leap 15.3
baseurl=https://download.opensuse.org/distribution/leap/15.3/repo/oss/
enabled=0
gpgcheck=0
#gpgkey=

Make the chroot and RPM directory

mkdir /mnt/opensuse-leap-15.3
mkdir /mnt/opensuse-leap-15.3/var/lib/rpm -p

Mount /dev, proc, and sysfs

for i in proc sys dev; do
  mkdir -p /mnt/opensuse-leap-15.3/$i
  mount --bind /$i /mnt/opensuse-leap-15.3/$i
done

Initialize the RPM database

rpm --root /mnt/opensuse-leap-15.3 --initdb

Deploy!

yum --disablerepo=\* --enablerepo=opensuse-leap-15.3 --installroot=/mnt/opensuse-leap-15.3 install aaa_base rpm-repos-openSUSE-Leap bash zypper util-linux

Get inside the chroot:

chroot /mnt/opensuse-leap-15.3 /bin/su -
el7-dev:~ # 

The rest of these commands are inside the chroot:

Setup DNS:

echo nameserver 1.1.1.1 > /etc/resolv.conf

Add the zypper repos:

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-openSUSE

zypper ar -r /etc/yum.repos.d/opensuse-leap-oss.repo

Profit!