When running the Alps du Zwift route uphill you get a section stats overlay. This also appears for runners and includes running power when using a Stryd foot pod. The reported values are matching 100% what I get on my Ant+ watch. This tells me that Zwift has 99% of the code to support running power for Stryd users already done.
Please include running power value in the top-left dashboard next to speed and heart rate for Stryd users.