Oh, wow. Saved? How did you do that? It is built-in stuff of GDevelop? Because I haven't investigated its persistent storage abilities.
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Yes, it’s built in! 🙂 you can serialize a structure variable to json and write it to a storage, HelperWesley made an useful video about that : https://youtu.be/Fm-BJDTaBCg
The name of the action has changed slightly since then, but it works the same, you can find actions under the storage Section.