Similar to fish_function_path and fish_complete_path, it would be helpful to have a fish_theme_path variable. This variable would be a list indicating where fish_config theme <cmd> would find its *.theme files.

This would allow Fish theme authors (like dracula and TokyoNight) to more easily migrate to using *.theme files. Fisher, a very popular fish plugin manager, now supports themes, but with limitations due to the lack of this functionality.