Want to add a widget to the Lock Screen

You can add a widget to the Lock Screen as follows.

1. Touch and hold the Lock Screen
2. Tap "Customize"
3. Tap the widget area
4. Tap "minical"
5. Tap the widget you want to add

How to add and edit widgets on your iPhone - Apple Support

With widgets, you get timely information from your favorite apps at a glance on your Home Screen, Lock Screen, or Today View.

Apple Support