A way to build custom (readonly) form components

[tordans]

This is my usecase: We have your Astro+Keystatic side and it is connected to a process that pulls Geodata from an external source (something like https://play.placemark.io/).
We have pages that have a map showing this geodata and content about the data in text form.

In the keystatic admin UI of this page, we have a dropdown that provides us with the connection between the page/post/content and the external geodata that we have a in folder in our project.

What I am looking for: Is there a way to add a custom component to the admin UI of this content, that I can control/write myself?

What I would like to do is: Once the user choose the content-relation to the static geodata content in the form (and hits "save"), I want the custom component to make a lookup and show a preview of this data on a map … or even just as some text info.

So I am looking for a way to add custom (readonly) components to the form that change their content based on the input provided by the user via the form.