Right now, only js is supported out of the box, but I guess any language that can run via web assembly or other techniques could work. WebContainers has experimental python support, but it won't work with a lot of the dependencies you would usually utilize in python etc.

we should be able to use this as a vscode extension to solve this issue. is there an sdk to integrate this into electron apps?

We are finalizing an electron app as we speak. That will allow recording anything that runs on your own system