Adding custom fields to dynamic data list "Custom Fields" section without ACF/Metabox

I use my own code to register custom post types with their own custom fields (ie, I’m not using ACF/Metabox/etc). Bricks has no trouble accessing the custom fields (if field is ‘foo_bar’, referencing it as {cf_foo_bar}), but it would be nice if the Custom Field section of the dynamic data dropdown in the builder would have the possible field names added to it.

How are fields added to the “Custom Field” section of the dynamic data drop down? Is there a filter or is Bricks just tuned to go ask ACF/Metabox (if installed) directly? If there isn’t a filter yet, could there be?

I’m a moron, and had the Disable Wordpress custom fields in dropdown under Bricks->Settings->Builder enabled.

Disabling the flag (double negative logic can be confusing) brings the CUSTOM FIELDS section to the builder. I looked all over and couldn’t find this setting.

I would like to have the ability to add custom top level groups and data elements to the dropdown, similar to the Actions or ACF sections.

(can only post 1 image per post, this is my reference that CUSTOM FIELDS does indeed appear if you dont enable the disable setting above)