dnf-automatic from system:packagemanager:dnf:SLE_15 project
Select Your Operating System
Add repository and install manually
For openSUSE Leap 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/system:packagemanager:dnf:SLE_15/openSUSE_Leap_15.4/system:packagemanager:dnf:SLE_15.repo zypper refresh zypper install dnf-automatic