How to put widgets on Lock Screen iPad

Lock Screen widgets are currently possible on iPhones but not on iPads. See: How to add and edit widgets on your iPhone - Apple Support

and Use widgets on your iPad - Apple Support

Unlike iOS16 for iPhone, iPadOS 16 for iPad does not [yet] support lock screen customisation.

Likewise, the new active Astronomy and Weather Wallpapers are currently exclusive to iOS16.x for iPhone.

Apple do invite submission of constructive comments and feature requests via its Product Feedback portal. For iPad and iPadOS:

Feedback - iPad - Apple