Did you already build a system start script for loolwsd?
This one [HOWTO] Collabora 2.0 without using Docker not for prod
made me create that one:
[Unit]
Description=loolwsd as a service
[Service]
User=office
ExecStart=/opt/loolwsd/loolwsd --o:sys_template_path=/opt/loolwsd/systemplate --o:lo_template_path=/opt/libreoffice/core/instdir --o:child_root_path=/opt/loolwsd/jails --o:storage.filesystem[@allow]=true
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=on-failure
[Install]
WantedBy=multi-user.target