Support platform filter for targets of an AggregateTarget

To specify the dependencies of an aggregateTarget, you need to specify a targets array containing the targets name. However, generating the target results in a dependency with iOS+macOS enabled for each dependency.

Is there a way to set a platformFilter for individual targets?

Here's an example of what I'd like to achieve:

aggregateTargets:
  TargetName:
    targets:
      - MyApp
    buildScripts:
      - script: |
                echo "Run Script"
                myTool doSomething --fast
        name: Run Script

Start by tracing how AggregateTarget targets and buildScripts are converted into generated Xcode targets, then inspect how platformFilter is handled for ordinary targets. Define the behavior for a platformFilter on each aggregate dependency and verify that the generated project applies the requested platforms independently rather than defaulting to iOS+macOS.