Rendering External API data in a Blocklist view

Hopefully this is just a n00b question!

When rendering a normal page view, I can use a Controller to call an external api, and pass in that extra information to the view.

I’m now tidying up my site to use Blocklists which allow the CMS users to control the building of their pages.

But I can’t figure the correct way to populate my blocklist view with any external api data, as there is no corresponding Controller.

Is there such a controller - and any examples out there? Or am I barking up the wrong tree?

Many thanks


This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/108476-rendering-external-api-data-in-a-blocklist-view