swift build: warning: '--product' cannot be used with the automatic product 'ProductName'; building the default target instead

I have a Package.swift manifest as follows:

// swift-tools-version:5.4
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
    name: "long-package-name-ios",
    defaultLocalization: "en",
    platforms: [
        .iOS(.v14),
        .macOS(.v10_15)
    ],
    products: [
        .library(
            name: "PackageName",
            targets: ["PackageName"]),
        .library(
            name: "PackageNameImproved",
            targets: ["PackageNameImproved"]),
        .library(
            name: "PackageNameUI",
            targets: ["PackageNameUI"]),
    ],
    dependencies: [
        .package(
            name: "PackageLib",
            url: "ssh://apple.com/packagelib.git",
            .upToNextMinor(from: "1.2.3")
        )
    ],
    targets: [
        .target(
            name: "PackageName",
            dependencies: [
                .product(name: "PackageLib", package: "PackageLib"),
            ],
            path: "PackageName"),
        .target(
            name: "PackageName",
            dependencies: [
                "PackageName",
                .product(name: "PackageLib", package: "PackageLib"),
            ],
            path: "PackageNameImproved"),
        .target(
            name: "PackageNameUI",
            dependencies: [
                "PackageNameImproved",
            ],
            path: "PackageNameUI")
    ]
)

Package Manifest summary:

• 3 targets
• 1 target depends on the other one
• Only PackageName is compatible with macOS, the other ones are iOS-only

Build commands

Building long-package-name-ios-Package(builds all targets within the package) for iOS:

swift build -Xswiftc "-sdk" -Xswiftc "$(xcrun --sdk iphonesimulator --show-sdk-path)" -Xswiftc "-target" -Xswiftc "arm64-apple-ios15.0-simulator"

[137/137] Build complete!

Now trying to build just the PackageName for macOS:

swift build -Xswiftc "-sdk" -Xswiftc "$(xcrun --sdk macosx --show-sdk-path)" --product "PackageName"

[1/1] Planning buildwarning: '--product' cannot be used with the automatic product 'PackageName'; building the default target instead

And it proceeds with building the default target long-package-name-ios-Package for the macOS platform which obviously fails due to inability to import, e.g. UIKit or any other iOS-only framework.

Question

How can I specify to build only PackageName for the macOS platform? I'm open to creating an Xcode Package, Schemes and other different configurations, but the end goals should be to:

1. Integrate long-package-name-ios-Package (all targets) for iOS only
2. Integrate PackageName for macOS