Neo4J Pricing Offerings

Will Neo4J Aura offer a usage-based pricing model? Currently there is only a provisioned-pricing model with a set storage capacity per instance size. I don't want to keep returning to expand my database storage capacity if I hit a storage capacity limit.

For example, AWS Neptune has a Storage Rate as $0.10 per GB-month, MongoDB has $0.25 per GB-month, and Firestore has $0.18 per GB-month. Would I need to jump to Enterprise Self-Hosted for this pricing option? Is there a storage size limitation for Enterprise Self-Hosted?