You can try VstHost if you don't have standalone and have the output going to https://www.reaper.fm/reaplugs/ reastream-standalone.dll in the Biab Audio track insert reastream-standalone.dll
you may need something like https://vb-audio.com/Voicemeeter/banana.htm and
https://vb-audio.com/Cable/index.htm
you might be able to route without reastream just using Voicemeeter
you may be able to record an fx track and/or a direct input track.