OneLake Storage and Premium Capacity (P1)

Hello everyone!

Since I couldn't find an answer to the following question and since the online documentation (in my opinion) is unclear, I want to take advantage of this community to understand the following point:

Suppose a customer has a workspace with a Premium P1 capacity, a developer is able to create Fabric items (e.g. Lakehouses, Warehouses, Notebooks, etc.). Let's say we need to create a Lakehouse: do we need to buy (extra) storage to manage data? The answer should be "no" because I tested it (I was able to create it and ingest some data) but I couldn't find anything on the documentation online regarding the storage size. With a Premium capacity, is there a default storage limit? Can it be extended?

As I said, I couldn't find anything concrete online. Maybe some of you have the answer I was looking for 😀

Thank you all!

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