How to display custom fields in WordPress custom post type slider

Product:

WonderPlugin Slider, WonderPlugin Carousel

Question:

I've created an image slider using custom posts, and I wondered if there was a way to replace the post excerpt with a custom field? I'm using the Advanced Custom Fields plugin, as well as OpenHook if that might be needed. I'm seeing that %post_excerpt% is accepted in the description; is there something similar I can do to include custom fields I've created?
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