Describe the bug
There is no way for plugin authors to extend the link popup overlay options presented (regression from TinyMCE). This is a particularly important regression, as WordPress Core removed several options from the link editor in recent years to streamline the editing process, relying on a plugins to restore these features using the hooks available.

Additionally the classic editor, plugin authors can extend the link options presented in the overlay to add custom attributes and other link settings, such as this one. While WordPress shouldn't necessarily consider expanding the link options it provides with Gutenberg, it should allow plugins to extend those link options to support new options and provide backwards compatibility for WordPress Core removed features.

This would likely require filters be added to gutenberg/packages/format-library/src/link/inline.js.