No Gradient Option in animation tab

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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?

Screen Shot 2021-07-31 at 12.07.42
Screen Shot 2021-07-31 at 12.07.42480×1462 46.3 KB