Just install the lvm agent plugin on the Linux hosts.
The official plugins are available on the monitoring server via WATO (Monitoring Agents → Agent files → Linux/Unix agents - plugins) or directly at https://YOURSERVER/YOURSITE/check_mk/agents/plugins/
Just drop the lvm plugin file in the agent’s PLUGINSDIR on your monitored Linux hosts. Ususally this is /usr/lib/check_mk_agent/plugins. Plugin files need to have execute permissions (+x)