We’re generating completions all using static information from LS while REPL or Juno use dynamic information from running session.
What you want is actua kinda hard for LS to implement, because dataframe’s column is basically only available at runtime.
I made a PR that integrates VSCode’s completion with REPL (https://github.com/julia-vscode/julia-vscode/pull/1507) but we’re not settled down with how to use those dynamic information yet.