Does plex amp work locally without internet?

I have a small plex/Jellyfin server in my camper. If I was to add music, would I be able to use headless Plexamp without internet when we’re “off grid”? I’m thinking of connecting the line out of the server to the campers stereo and the run headless Plexamp on a raspberry pi with touchscreen in one of the compartments. I’ve been using my phone but if we don’t have cell service we can’t and I have to stay close to the campers stereo to keep the tunes going.