The [PlantUML VSCode extension](https://github.com/qjebbs/vscode-plantuml) (by jebbs) supports syntax highlighting and rendering PlantUML diagrams in VSCode.
Launch VS Code Quick Open (Ctrl+P), paste the following command, and press enter.
```
ext install plantuml
```
Use `Alt + D` to render a preview of the diagram right in VSCode!