getting Aria2-with-webui to work with nginx reverse proxy

[Celoxocis]

I've recently installed this Aria2-with-webui using this docker image:

i have a couple of other docker images that provide different services. all of those apps web based GUI are accessible from the outside through nginx reverse proxy. such as
https://my.domain.com/app1
https://my.domain.com/app2
etc

i've tried to access aria2-with-webui through the nginx reverse proxy but without success.
Aria2 with it's UI runs on port 6880
so my nginx location path looks like this:

Aria2

location /aria2 {
proxy_pass http://192.168.X.Y:6880;
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
}

but all i get in return is error 404. I have tried different approaches without success.
could you by any chance give me a hint in how to access the aria2 gui properly with nginx?