Could you add the option to change the color of the change highlights?
Recently I've been using Raycast's "Fix Spelling and Grammar" feature, which highlights the changes in red. I've found that small change to be a huge quality of life improvement, although the overall experience is not as refined as Kerlig.
I am someone who reads through all the suggested changes, and picks and chooses the ones I want to implement. One of Kerlig's standout features for me has been the ability to see all the suggested changes. However, given the subtle color difference, it can be easy to miss small changes, like an added comma.