Customizing on-screen keyboard
Hello,
Is there any way to customize the on-screen keyboard on Mac and add special characters that are missing there? For example, I would like to add the characters H̠ h̠ instead some other that I don't use (when I press option to see the special characters in the English virtual keyboard).
I usually use emoji viewer but I would like to customize the keyboard viewer.
Thank you
MacBook, macOS 10.15