How have you implemented this? That is really trivial. Well compared to writing a text editor. I say this as the author of several failed text editors, so I'm not suggesting you lack the skills.
Carriage returns get filtered out when loading files, so the in memory representation always only has line feeds. And when saving it just save the in memory representation (so UTF-8 and with line feeds). I haven't added support for saving it with the original encoding and line endings because I never needed it, but yeah that should be easy to add.
But for the internal representation I would probably still only use line feeds because supporting carriage returns in there would make some things more complex
Showing a rich interactive tui like this to 15 year old me would have me convinced I was in a fever dream. It's amazing how far they have come. Seeing debugging is kind of blowing my mind.
Author here, it definitely has some inspirations from vs code, but I would describe it more like Neovim or Helix, but with a native GUI version and a some things builtin which are plugins in e.g Neovim