WordPress 4.7 introduced “Post Templates” that behave just like Page Templates:
https://make.wordpress.org/core/2016/11/03/post-type-templates-in-4-7/
Would like to be able to use this as a Location Rule for a Field Group, just as we are able to use Page Template as a Location Rule.
What version of ACF are you using. I’m pretty sure that this was included in a recent update of ACF 5. It’s not available in ACF 4. The developer has announced plans to release a free version of 5 soon https://www.advancedcustomfields.com/blog/acf-2016-year-review/
I think that Elliot is concentrating on getting the free version on 5 published. The only thing he’s adding in 4 are what’s needed to fix bugs due to WP updates. I’m hoping it’s out soon myself. I’ve already started publishing my own plugins that on WP that will only work with 5.