Guild Wars 2

I tried searching deluxe and upgrade and didn’t find anything, so apologies if this has been covered somewhere. But I remember that for the base game you could upgrade to deluxe via gems and was wondering if that was possible to upgrade to the heart of thorns deluxe if you already have the base? I’m right now sitting with a gifted physical box with receipt and am trying to decide if I should return it for cash and just grab the deluxe version or open it now(I do enjoy having the physical cases on my bookshelf)

So if anyone can tell me that if once they have the expansion on their account and no deluxe, is there an option in the black lion trading post to upgrade?

if you have base HoT there is an option to upgrade to deluxe HoT in the gem store for 2400 gems