Using Cocoapods one target multiple platforms

I want to try to get Firebase SDK working for both iOS and macOS app using the new Apple Catalyst project (porting iOS app to macOS).

I've already setup my Xcode project with Cocoapods and it's working fine using this pod file:

platform :ios, '11.0'

abstract_target 'SharedPods' do
    use_frameworks!
    pod 'Perform'
    pod 'Nuke', '~> 7.6.1'
    pod 'PureLayout'
    pod 'DeviceKit', '~> 2.0'
    pod 'lottie-ios'
    pod 'Highlightr'
    pod 'Firebase/Core'
    pod 'Firebase/Database'
    pod 'Firebase/Auth'
    pod 'Fabric'
    pod 'Crashlytics'
    pod 'GoogleAPIClientForREST/Sheets'
    pod 'GoogleSignIn'
    pod 'SwiftLint'

    target 'xxxxx-app' do
    end

    target 'xxxxx' do
    end
end

post_install do |installer|
  installer.pods_project.targets.each do |target|
     target.build_configurations.each do |config|
        config.build_settings['LD_NO_PIE'] = 'NO'
     end
  end
end

However, how do I add so that it builds for macOS as well using the same target (xxxxx-app in pod file).