Could use a macro or something like that

I have a pretty basic traefik setup going, using letsencrypt to get certificates and so on.

First I start a whoami container and serve it on my public ip. Good. Next I launch a second whoami. Let me show you the docker-compose.yaml

version: '3'

        image: containous/whoami
        restart: always
          - traefik

          - traefik.enable=true
          - traefik.http.routers.r2.rule=Host(``)
          - traefik.http.routers.r2.tls=true
          - traefik.http.routers.r2.tls.certresolver=letsencrypt
          - traefik.http.routers.r2.middlewares=SecureSslHeaders@file,compressor@file

        external: true

Notice how I had to change the file quite a few places, especially the route name bugs me - where I had to add a 2 on every line. This calls for typos.
Would have been nice to have a SELF macro to put in there.

Of course this a simplified example, but I do quite often find my self copying a docker-compose.yaml to a different folder just to try something out. If I forget to rename the instance names, in this example the route name, I am likely to break the source container when the new one overwrites something important, simply because of a name clash. The same goes with services and middlewares.

Any fool proof suggestions?

I have recently migrated from 1.7 where I found things easier/simpler.