caption colour keyboard shortcut

Would it be possible to have a plugin or feature where we can select a word or group of words of a caption and change its colour with a keyboard shortcut. for example we have shortcuts 1, 2 and 3 and each number is set to a different colour. It would half my editing time especially for short form content. I know you can do this with Auto Hotkey on windows but there isn't an alternate option for mac and I don't know how to code a programme to run that.