I can do something like this? (Two Dgraphs in the same host, different ports)

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Ok, so from what I understand you want to run two completely unrelated instances of Dgraph (Server and Zero) on the same machine using Docker Compose.

You can do it using the following docker-compose.yml

version: "3"
services:
  zero1:
    image: dgraph/dgraph:latest
    volumes:
      - /tmp/data1:/dgraph
    ports:
      - 6080:6080
    restart: on-failure
    command: dgraph zero --port_offset -2000 --my=zero1:5080
  server1:
    image: dgraph/dgraph:latest
    volumes:
      - /tmp/data1:/dgraph
    ports:
      - 8080:8080
      - 9080:9080
    restart: on-failure
    command: dgraph server --my=server1:7080 --memory_mb=2048 --zero=zero1:5080
  zero2:
    image: dgraph/dgraph:latest
    volumes:
      - /tmp/data2:/dgraph
    ports:
      - 6081:6081
    restart: on-failure
    command: dgraph zero --port_offset -1999 --my=zero2:5081
  server2:
    image: dgraph/dgraph:latest
    volumes:
      - /tmp/data2:/dgraph
    ports:
      - 8081:8081
      - 9081:9081
    restart: on-failure
    command: dgraph server --my=server2:7081 --memory_mb=2048 --zero=zero2:5081 -o 1

You can also verify that things are setup correctly and both of your single server clusters are working fine by checking

http://127.0.0.1:6080/state and http://127.0.0.1:6081/state