Add Field Settings option for Dropdown to make an API call [RESOLVED]

I’d like to write a plugin that will add an option to the dropdown field so that I can add a URL to a web API. Something like in the image below.

Then when a form is viewed, I would have the plugin look for the “URL to Web API” field value, fetch the data from the API and populate the dropdown. Like outlined here: Dynamically Populating Drop Down, Radio Buttons or Multi-Select Fields - Gravity Forms

Is there documentation on how to add the “URL to Web API” field so it is displayed in the Field Settings?

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The example in this documentation is the best starting point I’ve been able to find. Should hopefully get you most of the way there.

gform_field_advanced_settings - Gravity Forms Documentation

I think that is what I need. Thanks for pointing it out.