What I wonder is: Of the items that are rerouted, does Vietnam (or other similar countries) tend to move up the value chain over time? Or do the supply chains

What I wonder is: Of the items that are rerouted, does Vietnam (or other similar countries) tend to move up the value chain over time? Or do the supply chains just stay as they are. I suspect, possibly hopefully, that over time the "rerouting" countries would evolve from simple assembly/repackaging to sourcing more granular pieces of the manufacturing process from within their own borders. How fast that might happen is another question. If anyone has any sources on this I would love to read more about it, I'm just not sure how to find them.