Static reverse proxy without files / dynamic config

Traefik Traefik v2
,
1

I'm trying to create a very simple static reverse proxy configuration which is the same on all deployed swarm workers.

It will route local HTTP traffic to port 6080 to the swarm manager http://node-name:1234 via the Overlay Network.

Ideally want to avoid touching the host OS at all when deploying this - looking for a simple Docker based alternative to volumes/files for the dynamic configuration.

I was hoping I could put everything into the command/environment variables, but I can't find a way to configure HTTP routers/services there - may have missed it?

If it isn't possible to configure end to end static services using the CLI/Env variables, any ideas how I could accomplish this in another way (perhaps passing file contents in the compose file directly for example?). I see the HTTP dynamic discovery option - but that'd mean running a web server somewhere in the swarm (doable but not ideal).

## DYNAMIC CONFIGURATION
http:
  routers:
    server-updates:
      rule: "HostRegexp(`updates.servers.dummydomain`)"
      service: server-updates-service
      entryPoints:
        - nebraska
  services:
    server-updates-service:
      loadBalancer:
        servers:
        - url: "http://node-name:1234"

## Stack Compose File
version: "3.5"
services:
  revproxy:
    image: xxxxxx/traefik:v2.5
    command:
#      - "--providers.file"
#      - "--providers.file.filename=/etc/traefik/revproxy.yml"
      - "--serverstransport.insecureskipverify=true"
      - "--entryPoints.server-updates.address=:80"
      - "--log.level=DEBUG"
    ports:
      - 6080:80
#    volumes:
#      - /opt/revproxy/revproxy.yml:/etc/traefik/revproxy.yml