How can the lockscreen be customized?

Customization
2

I tested the lockscreen extension on Zorin 18 live session and it worked. It is possible to set a custom image and adjust blur effect.
Install the gnome extension and then lock your screen, then click on the top left icon "lockscreen extension" to select the image and set the blur radius and blur brightness.

Edit: It also worked with the gnome extension "Lock Screen Background".

Here you can see two guides about the two gnome extensions:

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