We use the starter in many bakes, but especially in sweet baking. Vanessa has a new book coming out in September which is full of sweet sourdough recipes… https://www.sourdough.co.uk/courses/pre-order-the-sourdough-school-sweet-baking-nourishing-the-gut-the-mind-signed-copy/
There are full details of how to refresh and maintain a chocolate starter on The Sourdough Club website… https://thesourdoughclub.com/how-to-refresh-a-chocolate-starter/