No. Larian promised official mod support, which for DOS2 is far superior to anything we have with BG3 today. In DOS2, Larian allowed us to use the divinity engine to build our own worlds and script our own adventures or simple dungeon crawls.
The last we heard anything on this was in mid August when one of their community updates said, "OH yeah, and we'll also bring you official mod support at some point too."
People have asked and asked, but Larian has stayed tight lipped on this and refuses to answer or comment on it. It seems Larian already got more success than they bargained for and don't feel they need to keep this particular promise.