How to extend the URLPopover render settings for the paragraph Gutenberg block?

It cannot be done, no API currently exists to add what you want to add.

If we look at the component that implements this:

https://github.com/WordPress/gutenberg/blob/5b01c97c6943890abb44b2154392ffcccef87b3e/packages/format-library/src/link/inline.js#L197

The InlineLinkUI wraps a component that wraps the URLPopover component, and places a child component inside it which is how the new window checkbox is added. No slots are present or hooks for intercepting this.

Judging from what you want to do, I don’t think this is the intended path forward. Instead, build a block, or a new inline block. You can also open an issue on the Gutenberg GitHub requesting the feature

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