Amazon Linux v 2.0 does support systemd and comes installed by default:
cat /etc/os-release
NAME="Amazon Linux"
VERSION="2.0 (2017.12)"
ID="amzn"
ID_LIKE="centos rhel fedora"
VERSION_ID="2.0"
PRETTY_NAME="Amazon Linux 2.0 (2017.12) LTS Release Candidate"
ANSI_COLOR="0;33"
CPE_NAME="cpe:2.3:o:amazon:amazon_linux:2.0"
HOME_URL="https://amazonlinux.com/"
rpm -qa | grep -i systemd
systemd-libs-219-42.amzn2.4.x86_64
systemd-219-42.amzn2.4.x86_64
systemd-sysv-219-42.amzn2.4.x86_64`