How to remap a option + i to give me ^, for then to press a vowel to use the accent in Karabiner

I recently changed the keyboard input to ABC - Extended because the normal one wouldn't let me type accents when the caps lock was on. Almost all of the are normal, but there are one there isn't. When I typed option + i, it gave me ^, and then I would press the vowel. But now it gives me '. Is there some way to do it in Karabiner? I tried playing with the config file but couldn't do it.