How to specify Platforms (platformFilter) for dependencies

[ElfSundae]

45B9DBB41F62A04002DAB9DB /* PBXTargetDependency */ = {
    isa = PBXTargetDependency;
    platformFilter = ios;
    target = 94E563A2FD80462D82C4E977 /* watchOS Example */;
    targetProxy = DAC46A191E3ACE32B698613E /* PBXContainerItemProxy */;
};

I'm trying to support Mac Catalyst for an iOS app, Xcode shows error:

Building for Mac Catalyst, but the embedded app 'watchOS Example.app' is building for watchOS. You may need to restrict the platforms for which this app should be embedded in the target editor.

So how to specify Platforms (platformFilter) for dependencies? Thanks.

FYI: https://developer.apple.com/documentation/xcode/creating_a_mac_version_of_your_ipad_app#3226802