Microsoft has released a new beta version of the SwiftKey keyboard (18.104.22.168), which includes integration with the Microsoft To Do service. The To Do icon would automatically appear in the keyboard toolbar after installing the SwiftKey update.
You may be aware of the Microsoft SwiftKey keyboard for Android (and not just for Android). The app, which was acquired by Microsoft and now comes with their branding, is often preinstalled on many modern devices. It came to our knowledge that the Redmond software giant is working to add a cloud sync feature to the app.