Like people said above right now the official answer seems to be no but I don't think it is a big deal since there are ways to increase party size on your own

Larian's Biggest Oversight, what to do about it, and My personal review of BG3 EA
"74.85% of you stood with the Tieflings, and 25.15% of you sided with Minthara. Good outweighs evil, it seems."