Scribe
Legend
Okay I looked into it, DOS2 gift bags were based on the most popular DOS2 mods, but made by Larian, except Giftbag 5 which was outsourced to another company, which is also an option Larian might concider, like if WotC wants say their own Toque Studios to do some DLC Expansion content, Larian might be open to that.
Still given there were tags for an absolute ton of races, including Warforged early on during EA, it's clear Larian licence covers all D&D races at least, except CR and AI book races, although they could make a side deal to licence their races too.
Sure, none of that matters though if Larian does the work (assuming the license allows for it, yadda yadda).
The point of contention is that modders are not going to do the work, Larian then just pack that up and ship it, as its Wizards IP, and modders do not have the license.
At the very least it would all have to get scrubbed, reviewed, and approved, and 'owned' by Larian, with at best a nod to the modders in the readme/release notes.