Automatically updating themes and plugins to .gjs file format

Is there a way to do this using the Docker-based development setup from Install Discourse for development using Docker, i.e., without installing pnpm or other node stuff directly on the host?

I guess I’d have to use d/pnpm in place of pnpm, but how would I instruct it to act on my plugin rather than the discourse source code? I have them in sibling directories: