Swift package with resources for iOS and tvOS

I'm in the process of converting my local frameworks to local Swift packages. Things are (mostly) working well but I'm struggling with one of the packages:

Package MyKit is used by an iOS and a tvOS app. It includes a storyboard for each platform. What is the most appropriate way to describe this in Package.swift? Xcode complains about iOS storyboards not being supported on tvOS so I moved them to their own targets, like this:

Code Block 
let package = Package(
    name: "MyKit",
    defaultLocalization: "en",
    platforms: [
        .tvOS(.v13)
    ],
    products: [
        // Products define the executables and libraries a package produces, and make them visible to other packages.
        .library(
            name: "MyKit",
            targets: ["MyKit"]),
    ],
    dependencies: [
        // Dependencies declare other packages that this package depends on.
        // .package(url: /* package url */, from: "1.0.0"),
    ],
    targets: [
        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
        // Targets can depend on other targets in this package, and on products in packages this package depends on.
        .target(
            name: "MyKit",
            dependencies: [
                .target(name: "MyKit-iOS", condition: .when(platforms: [.iOS])),
                .target(name: "MyKit-tvOS", condition: .when(platforms: [.tvOS])),
            ]),
        .target(
            name: "MyKit-iOS",
            dependencies: []),
        .target(
            name: "MyKit-tvOS",
            dependencies: [])
    ]

This builds fine but it seems clunky to me (and I'm having issues accessing the Main.storyboard file from the package itself.