Config to proxy the Node-red Dashboard as site sub-path

How have the configuration to be changed to proxy the dashboard to [myDomain.at/node-red-dashboard] (http://myDomain.at/node-red-dashboard) ?
current path : http://myDomain.at:1880/ui
->
http://myDomain.at/node-red-dashboard
Thanks!

> version: '3.3'
> 
> services:
>   traefik:
>     image: traefik:latest
>     container_name: traefik
>     restart: always
>     ports:
>       - 80:80       # <== http
>       - 8080:8080   # <== :8080 is where the dashboard runs on
>     command:
>       - --api.insecure=true
>       - --api.dashboard=true
>       - --api.debug=true
>       - --log.level=INFO
>       - --providers.docker=true
>       - --providers.docker.exposedbydefault=false
>       - --entrypoints.web.address=:80
>     volumes:
>       - /var/run/docker.sock:/var/run/docker.sock
>     labels:
>       - traefik.enable=true
>       - traefik.http.routers.api.service=api@internal
>       - traefik.http.routers.traefik.rule=PathPrefix(`/api`) || PathPrefix(`/dashboard`)
> 
>   nodered:
>     image: ctmagazin/ctnodered:latest
>     container_name: node-red
>     restart: always
>     volumes:
>       - nodered_data:/data
>       - /etc/localtime:/etc/localtime
>     environment:
>       - TZ=Europe/Vienna
>     labels:
>       - traefik.enable=true
>       - traefik.http.routers.nodered.rule=Host(`monitor.myDomain.at`)
>       - traefik.http.routers.nodered.entrypoints=web
> 
> volumes:
>   nodered_data: