Request for documentation

[woutersf]

I am working on a Block that fetches remote content from a JSON feed (this is interesting for pre-filling newsletters).

I am doing this here in this github repo:
https://github.com/woutersf/grapesjs-block-drupal-content-feed

It is not clear for me how I should make this (custom) block configurable.
If users want for example to render the content in different html (in columns for example).
Is there a possibility to ad an overlay of sorts with configuration or should I configure this externally and add it to the plugin options?

[artf]

This could be achieved by creating a custom component