[Plugin: Custom Post Widget] How to add additional fields?

Thanks for this plugin – I’m always on the lookout for an easier way to input content into widgets and really like this approach!

I’m wondering how to add additional fields for the custom post type? Is this as simple as using one of the custom field plugins to add fields to this custom post type? Is it easy to interface this?

Thanks,
Jonah

https://www.ads-software.com/extend/plugins/custom-post-widget/