Stryd is compatible with the Zwift app. When you pair Stryd to the Zwift app, the app will only use distance and pace from Stryd. You will still be able to see your data in PowerCenter after the run by either offline syncing your Stryd or uploading the FIT file from your Zwift account. Power will be visible in your Zwift profile after the run.
Note that Zwift uses Bluetooth to connect to your Stryd. This means you must unpair your phone from Stryd since it only supports one bluetooth connection at a time.
If you have any problems, contact firstname.lastname@example.org