Display name of parent page in Wagtail admin form

Question

When creating a new Page of a specific type in the Wagtail admin I'd like to prominently display the title of its parent page. Not necessarily exactly like this, but as an example:

I assume I'd need to create a custom admin form and... a template? I'm handy with Django and Wagtail but have never customised Wagtail's admin beyond adding fields and panels so am a bit lost.

The reason? Because for this particular page type, the context of what page it's "within" is pretty important. And by default the parent page's title is only visible in the tiny breadcrumbs at the very top of the page.