Copy/pasting multiple lines of text at once into a cloneable Custom Field

Is it possible to set up Custom Fields to copy paste multiple lines of text into a cloneable Custom Field (or similar)?

This is what I'm seeing right now:

Currently, I need to click + Add more multiple times to create new input boxes and copy/paste each link in one by one.

What I'd like to do is copy ~20 URLs into this area at once, if that's possible.

Thanks in advance!