No Repeaters in Layouts?

I'm trying to use the Layout code for a template.

My understanding is that using Layout will allow me to offer multiple, pre-defined content layouts to a user. This is what I want to do.

One of those layouts involves a table with multiple rows, displaying information about a variable number of topics. Since the number of topics is specific to each newsletter, this should be set up as a repeater, so the user can add a new row as needed.

But, I'm getting an error because the repeater for this layout is inside of the repeater that contains all of the layouts, and nesting repeaters isn't allowed.

Does this mean that layouts can't contain repeating elements? If so, this seems like a massive flaw. Anyone have a workaround?

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