Change prices for existing customers with paid plan

To my understanding it is not possible to change prices for existing customers with a paid plan. For my business I need to re-evaluate prices of my plans on a yearly basis. I don’t want to force my customers to re-purchase a plan every year. It would be so much better if I could use an ‘opt-out’ approach: Inform them about upcoming price changes and provide them the opportunity to unsubscribe if desired. Please add the feature to change prices for existing customers.