Why you need this feature:

It would be nice to have on pre-installed extensions on vscode workbench

Describe the solution you'd like:

Add some extensions without the need to go and install them all over again on vscode. Like Python/Jupyter/etc.

Anything else you would like to add:

There is a CLI on VS Code able to do this on a docker image. Ref https://code.visualstudio.com/docs/editor/command-line#_working-with-extensions