Set Source Elements Nexus as Ext In using Control Room while using Apollo interfaces

Guys, sorry for the very very long topic title

Its simple

I have Cubase and Pro tools open at the same time

I want to be able to send audio from Pro Tools via the Source Elements Nexus Plugin to cubase

I already know how to set it up on an audio track, but would love to be able to set it up as an external input on the control room. However, because I am using UAD Apollo x8, I dont see the option to set the plugin as an input

Could anyone tell me if this is even possible ?

Thank you