To maintain SMART functionality, you can control your trainer with a Xert app (smartphone or Garmin Connect IQ player) while linking power only to your simulation platform.
Here’s how to do that with Zwift –
The Ultimate Guide to Training with Xert and Zwift – Xert (baronbiosys.com)
Related post that details what you lose by exporting to ZWO –
Workout integration with Wahoo - Support - Xert Community Forum (xertonline.com)
If you just want something to watch while training indoors another option is a solo session.
That entails running the workout on a Xert app while watching the Session Player on your PC/laptop/tablet. Quick way to test that is visit (2) Xert - Sessions (xertonline.com), wait a few seconds for Library tab to appear, find an entry of interest, select Play Now, then start the Xert app. That workout/session will be pre-selected, ready to Start.
Xert solo/group session tutorial: (4) Xert - Xert Video Player (xertonline.com)