Actually, this is not a Problem or Issue of Innovation Extend. This is a new feature request.
You can change the Text Color to different one in Per Slide Basis. Thus you can use different Text Colors for different Slides so that your Readers can read. We have noted your suggestion. But, we don’t have any Plan to introduce this feature with Innovation Extend because the Slide Height is smaller than the Awesome Extend. There are so many things to be considered during a Theme Design. You can also edit your Images to adjust with the Slide Text.