No Gradient Option in animation tab

https://preview.webflow.com/preview/stellaris-main-page?utm_medium=preview_link&utm_source=dashboard&utm_content=stellaris-main-page&preview=88f41260a1e07e8428855dd39b0a3c83&workflow=preview

There’s only an option for transitioning to a single background color, but not a gradient. Am I missing something or is this a missing feature?