Hmmm, I'm not getting that.
What version of vscode are you running? The highlighting is done VS Code. This is the code in here https://github.com/microsoft/vscode/blob/main/extensions/swift/syntaxes/swift.tmLanguage.json
By the way there is a section for vscode-swift in the related projects section of the forums VSCode Swift extension - Swift Forums. We shouldn't need to keep extending this thread.