The extensions are Technology Preview.
GraalVM - GraalVM Extension makes the VS Code a friendly and comfortable development environment for GraalVM users. It allows to easily download and manage multiple GraalVM installations and integrate them into the VS Code, and enables all the unique GraalVM scripting & polyglot features.
Micronaut - Micronaut Extension adds support for the Micronaut framework in the VS Code development environment. The extension has been designed to cooperate with the GraalVM extension for a smooth Micronaut applications development, including debugging and building GraalVM native images.