How to implement automatic replacement of words with characters?
For example, when I write “square-fill” in the input field, I need to make an autocorrect to “SqF” (or other unicode characters). As I understand it, it is necessary to use “features”, but I did not understand what exactly to choose.
This shouldn’t be done in a font. This is the job of the input method. Check out System Preferences > Keyboard > Text where you can set up autocorrects. They will work across all your devices that are hooked up to your iCloud account.