No.
Larian has stated their intent is to finish the official campaign first.
Modding support must be co-ordinated with Stadia as well who have yet to to implement a solution to modding.
I would not expect any modding support until official release in a year or so.
Larian of course is aware of the desire for modding and are making decisions that won't preclude it, however it likely won't be available for a while.
