If there was a vscode extension that had half the power of jjui, I'd consider it. But that's not the case. jjui is just amazing.

Of course there are some people that will want a gui not matter what. Then an extension or separate program is the only thing you can do. But i think it is really nice to have the same tool available everywhere, also in the terminal. And if you want a neat and vertical pane in vscode just drag a new terminal window next to your code and run jjui in it.