Following news on Zillow app started using SharePlay it is now turn for productivity app to adopt this feature.
Task management app Reality Tasks is now using SharePlay.
You can now share collections easily via SharePlay! Share tasks by just clicking on the blue button in the bottom right corner.
Reality Tasks – what's new
After you finish your FaceTime call, you will be still able to edit the same collection in real-time due to the cloud sync. The feature works across iOS and macOS as well.
Reference: ‘Reality Tasks’ is the latest productivity app to take advantage of SharePlay
App Store: Reality Tasks: Kanban & To-Do