[Feature Request] Traefik host rule extract

[modem7]

Description

Currently, if we wish to have an external link attached to a service, we have to do:

    labels:
      ## Homepage
      - homepage.group=Media
      - homepage.name=Bookstack
      - homepage.icon=https://raw.githubusercontent.com/modem7/MiscAssets/master/Icons/HeimdallIcons/bookstack.png
      - homepage.href=https://$DOMAINNAME
      - homepage.description=Wiki

If we're using Traefik, this is already set via:

    labels:
      - "traefik.http.routers.bookstack-rtr.rule=Host(`$DOMAINNAME`)"

Is there a way to implement a way to automatically extract the Host rule from Traefik and attach that as a homepage.href?

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