Add an encyclopedia tab that shows what buildings produce a resource and what buildings take that resource to produce something else.
Hey! I'm not sure if this is precisely what you're looking for, but the game has similar functionality already: Recipes Panel (default hotkey: U). It allows you to search for goods that are either ingredients or end products in the Recipes available in your buildings. I hope this is useful ^^
It's kinda like what I was suggesting but it only shows what you can produce currently. I was thinking of something that shows everything in its totality that way you can make a more informed decision on what blueprints you wanna pick up (for the newer players like myself) or have an idea of the build you're going to head towards.
Oh, I should have mentioned there's also a Show All checkbox that shows all the buildings in the game (not only the ones you have) :D