Unable to pass `tvOS` `source`

[markst]

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The source defaults to "iOS"

let source = configuration.additionalConfiguration[CrossPlatformAttributes.ddsource] as? String ?? "ios"

But we are unable to configure the additionalConfiguration to add "tvos" as a string:

'additionalConfiguration' is inaccessible due to 'internal' protection level

Affected SDK versions

2.26.0