What does the parameter *labels* and *env* in docker daemon.json do?

What does the parameter labels and env in docker daemon.json do?

  "log-driver": "json-file",
  "log-opts": {
    "max-size": "10m",
    "max-file": "3",
    "labels": "test",
    "env": "os,customer"

After reading the docker documentation, there is no description for it. And I set it up, I didn’t find anything that worked.

Is it just a marker for docker daemon?

Reference document:dockerdDocker object labels