Hello, Ryan Black 7505
That's an interesting requirement.
Regret, there is no way to save that spotlight at present.
Nevertheless, till the time the feature becomes available, you can use this workaround in future.
Now, Android 11 allows Screen recording.
If that's not available on your handset, you can look for third-party apps.
Start the spotlight after activating the screen recording.
You can use the video editor in Google Photos to trim the start and the end. In this way, now you will have the entire movie available for sharing.