change lock screen wallpaper(only) or add a wall screen widget

My goal is to add my gym bard code to the lock screen so that I dont have the take my key out everytime I go to the gym.

Is there a way to either
1. change the lock screen wall paper only not my phone wall screen so that I can edit the bard code into it?

or

2. add a lock screen widget / notification with my bar code on the bottm?

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