The new Retro Assembler Extension for VS Code 1.3.0 is now capable of using IntelliSense and Code Completion to help entering Directives like .macro and it can display a short description and examples for each. Just type "." and hit Ctrl+Space to show the available Directives, or you can start typing what you need and hit Tab to insert the Code Snippet for the chosen Directive.
These helper entries don't list all possible parameters and full description due to the space limitation in the code editor window, but the most common cases are covered. It makes writing code a lot easier. For further information on the minute details you should still refer to the assembler's documentation.