Recommended way of building and deploying plugins

When I am building and testing a plugin project, I can just add the plug-in library to dependency of the executable I am testing in the project, and add `-fplugin` to the `ghc-options` and things work.

If I (v2) install the plugin library I can't find a way of easily getting hold of it in other projects. Adding it to the dependencies of the other project helps, but
* I can't seem to find a way of applying the plugin-in to only the exposed modules, and not the build-depends.
* As well as `-fplugin` I seem to have to add `-package` to even get that far, as otherwise the package / plugin is reported as hidden.

I have looked through some of the earlier issues, but did not find a solution.

Is there an example or further documentation anywhere that might provide some pointers?

Many thanks.