Repeater autosave relationship

I'm in the process of remaking a newsletter builder for my application. Right now i'm using the Builder component however it is causing a bunch of issues and it's not working properly with a lot of fields (mostly sub repeaters) and it's very brittle once it comes to reordering stuff inside it.

I want to replace it by creating a repeater with a relationship like i did in other parts of my app however I don't know exactly how to proceed if i want auto save on repeater updates so i can keep the live preview functionality.
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