How to depend on a non-macOS external package in macros

Hello everyone, I am trying to create a macro that depends on an external package to abstract some of the packages logic. The point is that the dependency does not support macOS which results in a build failure when trying to build the macro.

Since macOS 10.15 is required for creating macros, any thing can be done to get it to work?

Here is a sample to what I'm trying to do

import PackageDescription
import CompilerPluginSupport

let package = Package(
    name: "Stringify",
    platforms: [
        .macOS(.v10_15),
        .iOS(.v13),
        .tvOS(.v13),
        .watchOS(.v6),
        .macCatalyst(.v13)
    ],
    products: [
        .library(
            name: "Stringify",
            targets: ["Stringify"]
        ),
        .executable(
            name: "StringifyClient",
            targets: ["StringifyClient"]
        ),
    ],
    dependencies: [
        .package(url: "https://github.com/apple/swift-syntax.git", from: "509.0.0"),
        .package(url: "https://github.com/MyDependency", from: "1.0.0"),
    ],
    targets: [
        .target(
            name: "Stringify",
            dependencies: ["StringifyMacros"]
        ),
        .executableTarget(
            name: "StringifyClient",
            dependencies: ["Stringify"]
        ),
        .macro(
            name: "StringifyMacros",
            dependencies: [
                .product(name: "SwiftSyntaxMacros", package: "swift-syntax"),
                .product(name: "SwiftCompilerPlugin", package: "swift-syntax"),
                .product(name: "MyDependency", package: "MyDependency"),
            ],
                swiftSettings: [
                    .define("IOS_ONLY")
                ]
        ),
    ],
    swiftLanguageVersions: [.v5]
)