Work with CIF files and use the Visual Studio Code editor?
Have I got the extension for you!
https://marketplace.visualstudio.com/items?itemName=MatthewRowles.cifvsc
I've put together an extension for VS Code that helps you work with CIF files. There is syntax highlighting, tag autocompletion, and hover text definitions.
It comes bundled with a few dictionaries for single crystal, powder, and protein work, but you are also able to specify your own in your settings.json file.
It is also on github, so please let me know about bugs or enhancements.
https://github.com/rowlesmr/cifvsc
I hope you find it useful.
Matthew