When using Invoke Workflow File, in the import arguments panel, what types of expressions can be used in the value column?

In the Import Arguments panel of the Invoke Workflow File activity, in arguments can be given either hard-coded values or variables. In contrast, in/out and out arguments can only be given variables. This is because in/out and out arguments are designed to return data, so they need to be stored in variables to capture any changes made during the invoked workflow execution.
UiPath Studio Guide: Invoking Workflows and Managing Arguments
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