Vim has supported jump to definition via `ctags` for decades, works great for Ruby. Here's a tutorial from ThoughtBot (https://thoughtbot.com/upcase/videos/intelligent-navigation-...).

Vim also supports the same LSP implementations that VSCode uses via Coc.nvim (https://github.com/neoclide/coc.nvim), which provides the same code navigation features that VSCode has, including jump to definition.