Missing Cargo Buildings in Asset Editor?

[vortical]

I saw in the patch notes that custom Cargo Harbors are now useable. I went into the asset editor and it looks like cargo harbors and freight stations are still missing. Am I missing something here? Are there any plans to make those buildings available for editing at some point?

 

[vortical]

So no one has any insight on this? Even if what I want to do is impossible, at least KNOWING one way or the other would be nice.