Our Localization package does not add supported languages to the XCode project when exporting for macOS, tVOS and visionOS.
Currently is is guarded against via [a conditional at the top of BuildPlayerIOS.cs.|https://github.cds.internal.unity3d.com/unity/com.unity.localization/blob/ca144724cc876c78a8ebc2d9e2cd22a3d2c96633/Packages/com.unity.localization/Editor/Platform/iOS/BuildPlayerIOS.cs#L1]

Context from [~karl] :
{quote}We did briefly look into adding the support for MacOS a few years ago but there was some hard coded parts in the XCODE project file we couldnt change.
It requires changes in the Editor before the package can add the support.
I have not looked into tvOS but I suspect its the same.
{quote}