Can brand owners take back ASIN management?

We are a traditional business that have not done much e-commerce. We’ve contracted a third party as registered resellers of our brand on Amazon. They will also manage all ASINs of our brand, but not create company brand store. Our contracts specify that if we terminate the relationship, they must relinquish ASINs back to us as well as any of the data. We are working on building an e-commerce capability at the moment so that we can do it in house in the future.

My question is, if we set up a Amazon brand store in the future and want to take back the ASINs (to not lose products history) management, is that easy to do? Will there be problems?