It’s one hell of a request to do. I can only give you pointers. Unless the code to do that is available, I don’t think anyone will attempt this until months or years later.
I think the code is similar to recursive binary tree generator at the line nova vertex end with some additional modification so that dendriets don’t intersect after some small angle of 3 degrees.
Think about it geometrically. Don’t look them as splines but as straight lines. After the recursion is made with straight lines, we could warp it to get smooth splines.
Even in the example above, there are obvious breaks in the branches, though most of the transitions are quite good. The organic pattern reminds me of extreme closeups of the eye in movies and shows.
With some modifications, it could have Lovecraft vibes or the appearance of fur or other fibrous features.