[Plugins] Access value of a StarExpr

Hi folks, I'm trying to add support for StarExpr in a plugin but I'm unable to figure out the value of the StarExpr, here's an example of the code I want to make a plugin for:

def fake_union(name: str, types: Tuple[Types, ...]) -> Union[Types]:
    ...

UserErrors = (A, B)

Response = fake_union(types=(User, *UserErrors), name="Response")

I don't know if this is possible to figure out using MyPy, so far I was only able to fetch the Var definition, but not the type

def union_hook(ctx: DynamicClassDefContext) -> None:
    types_expr = ctx.call.args[ctx.call.arg_names.index("types")]

    assert isinstance(types_expr, TupleExpr)

    for type_ in types_expr.items:
        if isinstance(type_, StarExpr):
            assert isinstance(type_.expr, NameExpr)
            name = type_.expr.name

            # how can I find the value of this expr?
            print(name)

I made a repo with a full example here: https://github.com/patrick91/mypy-star-plugin

Start with the plugin example repository and the DynamicClassDefContext, TupleExpr, StarExpr, and NameExpr entry points shown in the issue. Trace how the plugin can inspect the StarExpr for UserErrors, then verify that the example can access the expanded value when processing the types argument.