Configuring New whiteboard plugin (tldraw)

I upgraded to 5.2.7 and was trying to get the new whiteboard plugin with tldraw to work.
The issue I’m facing is that I’m not a caddy user, rewriting the compose file was not a problem but as it seems the plugin is hardcoded to access port 6239 from the seatable installation:
I don’t really want to open up a new port but rather have it running under /tldraw for example.
So assuming my seatable is running under https://table.example.com I would want to have the whiteboad under https://table.example.com/tldraw

In my nginx I could accomplish this with

   location /tldraw/ {
       proxy_http_version 1.1;
       proxy_set_header Upgrade $http_upgrade;
       proxy_set_header Connection "Upgrade";
       proxy_set_header CLIENT_IP $remote_addr;
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
       proxy_set_header X-Forwarded-Proto $scheme;
       proxy_read_timeout 86400;
       proxy_pass http://10.10.10.10:6239/;
   }

now if I do a curl to https://table.example.com/tldraw/ping it am getting a correct response

{"status":"pong"}

so all I need is some magic setting to tell the whiteboard plugin to use a different URL for tldraw.
I checked the plugin zips but could only find the old excalidraw zips.

Sorry to tell you, but tldraw does currently not support a subfolder setup. The fact that you receive a “pong” shows, that you can reach the container, but nothing more.

Please try opening the port.

Best regards
Christoph

Opening the port creates additional complications. I’ll have to look at how I can get nginx proxy manager to do that, sure it’s possible but would then have to do the same at multiple clients.
But isn’t it similar to how seafile uses seadoc while it runs in a separate container, it sets up the reverse proxy to enable websocket for the path and passes it on internally to the container.
All it would need is a configuration value for the plugin where to reach tldraw.
Or am I missing something? I’m currently sick and my brain is a bit foggy.

Cris