Preview office document failed, libreoffice is intalled in other server

Hello, experts.
i have a problem about previewing office document.
when i excute occ preview:generate-all -vvv, CLI is showing like this:
sh: 1: /usr/bin/libreoffice: not found
for sure, i didn’t install libreoffice in. because i’ve installed in the other machine in the same local network. as the evidence, i could open&edit in nextcloud like this:

since in nextcloud libreoffice app setting, i set as like this:

i tried two configuration in config.php, neither was work.
‘preview_libreoffice_path’ => ‘/usr/bin/libreoffice’,
‘preview_libreoffice_path’ => ‘http://:9000’,
my question is how can i make preview work while i don’t install libreoffice in nextcloud server?
allow me to avoid uploading my env setting, as i don’t think it’s relevant to this issue.
look forward your help, thanks in advance!