There is a macOS build-in feature that will allow easy Simplified and Traditional Chinese Conversion. Usually it can be access via menu bar. If it’s now showing in the menu, it can be trigger by system hotkey.
Is it possible to have Obsidian to have that feature? Maybe it’s because it’s an Election app?
Note: to test this feature, you may need to add Chinese to system langue list. More information about this feature: https://support.apple.com/guide/chinese-input-method/convert-chinese-or-latin-characters-mchlp2865/mac