Files in pkgbuild installer component don't follow relocatable bundle

I have an app that requires to install itself as a folder along with a few support files. So I've defined a package component that installs itself somewhat like so:

/Applications/MyApp/MyApp.app /Applications/MyApp/Foo /Applications/MyApp/Barr

The application require those other files be in place to operate.

In order to make the installer requirement hurt a bit less in a world of drag and drop single bundle Mac apps - I'd like the support relocation so the user can move this folder wherever the like.

However - if I enable relocation - only the application bundle is relocated. The sidecar files continue installing to /Applications/MyApp.

Is there any way to get the companion files to relocate along with the application bundle?