usage in multiple compose projects

[casperdcl]

Is there support/guides for multiple docker-compose projects? e.g. something like:

# server/docker-compose.yml
services:
  caddy-gen: ...
  networks: [caddy-gen]
networks: {caddy-gen: {name: caddy-gen}}

# project1/docker-compose.yml
networks: {caddy-gen: {external: true}}
services:
  app1:
    labels: {virtual.host: app1.domain.com}
    ...

# project2/docker-compose.yml
networks: {caddy-gen: {external: true}}
services:
  app2:
    labels: {virtual.host: app2.domain.com}
    ...

This is useful to keep different unrelated projects in different repos.

Is putting everything on the same network sufficient for caddy-gen to pick up other services?

Obviously there won't be any depends-on entries in this case. Are there any other caveats?