PSRule-vscode/syntaxes/comments.json

{
  "scopeName": "PSRule-powershell-comments",
  "injectionSelector": "L:source.powershell",
  "patterns": [
    {
      "include": "#synopsis-comment"
    }
  ],
  "repository": {
    "synopsis-comment": {
      "match": "(?<=^# )(Synopsis:|Description:)(?= )",
      "name": "keyword.operator.documentation.powershell"
    }
  }
}