spring-tools/vscode-extensions/vscode-spring-boot/yaml-support/spring-boot-properties-yaml.tmLanguage.json

{
  "name": "Spring Boot Properties YAML",
  "scopeName": "source.spring-boot-properties-yaml",
  "patterns": [
    {
      "comment": "source.yaml is defined in vscode core",
      "include": "source.yaml"
    }
  ]
}