Monitoring SOLO in ProTools with a S6L AVB connection

[BobNunn]

We have a new Avid S6L-32D digital mixer. Using AVB, I've connected a Mac mini and installed a licensed version of ProTools 2020. Everything works great. ProTools tracks are automatically named from the S6L. Signals look great. Virtual playback of the recorded tracks back through the S6L is perfect. My question is, how can I solo a channel in ProTools while live recording or doing virtual playback? Output channels are mapped back to the S6L.

BTW: I know I can SOLO on the S6L and it's essentially the same as what I'm getting in ProTools. However, there is a engineer running the S6L for FOH live sound and I want to monitor ProTools without touching his board.