Accidentally, I found out that after upgrading Spring Boot from 3.1.1 to 3.4.2, it seems like I can place a JSON in the application.yaml file. For example:

  "service": {
    "name": "example-service"
  },
  "server": {
    "port": 8080,
    "shutdown": "graceful"
  },

It works. I didn't find this in any of the adoption guidelines, so I want to double-check if this is an expected feature or is something that will be changed in the future.