I ran docker-bluemap on the truenas scale host and used the local docker-mariadb database, and the minecraft server was running on another machine. Is there any way to make the docker-bluemap map show the player positions in the minecraft server?

No, only the plugin knows the player-positions. The docker uses bluemap-cli, which has no connection to the actual server. So there is no way for the cli to get the player-positions to show them on the map.

With a little tinkering, you can use the plugin to only send the player-positions and do the rendering on the docker, if you want that.

Please use our support-discord if you have further questions, GitHub Issues are only for bugs and planned features :)