How to only expose the public API of a project

I know that FORD has the ability to suppress (Fortran) PRIVATE items from the generated API, but this can be different than the public _project_ API exposed to end users. E.g., a common pattern in our code is to have a per-directory "package" module that forms an explicit list of the items that are meant to be exposed to other layers. E.g.,

```f90
module MyPackage
public
use module_1, only: item_1
use module_2, only: item_2
...
```

We don't expect anything fancy and automated (though that would be nice), but is there a way we can manually annotate our code so that only select items of the API are generated? I.e., we would go in and add some annotation in `module_1` for procedure `item_1` and `module_2` for procedure `item_2` to indicate that they should be generated. Or alternatively an annotation on all the other items in those modules that indicates _not_ to generate their interface.

And of course we would still want to be able to generate the full API for developers. I.e., to ignore these annotations when desired.