There's lots of old ways of doing things like with ReaStream to stream midi or audio back n forth to DAW's that can chain midi plugins.
https://www.dropbox.com/s/ck417kozmsar2a0/BB-Reaper-ReaStream.mp4?dl=0
(Video) How to Stream Biab Tracks to Your DAW Win/Mac for Heavy Plugins
They work the same way, allow you to hook the orange midi outs to midi ins:


This is just a normal thing that should have been in the Biab Plugin system. It's things I have mentioned years ago but did not get any interest until users finally figure out it is something they need in Biab.

Remember VST Sync, I went on for years n years about Biab needing that, where would you be now trying to use EZKeys EZDrummer etc.. without it.

How many +1 are here ? if you don't ask for it now, then when you do need it you won't have it.
VST Handling Fixes Needed

ImageLine MiniHost is another free chainer I used this before I found KV Element.
https://www.dropbox.com/s/k7q8ikg7e3pgx0g/Biab-RC-Ample-Bass.mp4?dl=0