Yes: you have to re-do the mod manually.
If you have the textures already extracted, you could try to slap the mod together, but, currently, there's nothing to convert them.
And I doubt that there will ever be something to do that.
Here's a tutorial for UE4 modding.
I'm done with BnS and helping its shitty remaining player base, so don't contact me for anything regarding the game. Just in time for us to get hit with the sig lock that prevents modding. This tutorial was supposed to be out like 4 months ago but I unfortunately never had the time to finalize...
www.bnsbuddy.com