Visual Studio Code Intellisense support

This extension is a nice addition which could potentially simplify the creation of a GitHub Action.

However, I still have to manually type the syntax and there's currently no autocompletion (aka IntelliSense which is invoked with `Ctrl+Space` on macOS/Windows).

Will there be support for such a feature?

EDIT: Probably something like this: https://stackoverflow.com/questions/46145607/custom-language-autocompletion-in-vs-code

EDIT No.2: API docs: https://code.visualstudio.com/api/language-extensions/language-server-extension-guide