Using AVIA layout builder on market press product

I need to use the avia layout builder (or copy the generated code from a page) in the description of a market press product.

I imagine there’s no way to activate the advanced layout editor in the product description editor, so the only option is to create a page with the layout builder, copy the generated code and paste it into the product description.

But how can I get access to the generated code ? If I switch back from the advanced layout builder to the normal editor I don’t get the code.

Thanks for your help

Antonio