I guess, asking for a custom patch, that launches VSCode with fish in the Terminal, is a bit much to ask for.
Other than that: How can I configure it by hand?
I have a terminal in multiple other applications, like Dolphin and Kate and it would be nice to have a consistent behavior between all of them. Nim and Rust are both configured in my fish config, to put them into my path. I also miss the autocompletion, like when selecting a file name.