How to add docstring to a function on an empty module?

How do I add a docstring to the function add on this module that does not import Core and Base?

julia> Animal = Module(:Animal, false, false)
Main.Animal

julia> @eval Animal add(x, y) = $(+)(x, y)
add (generic function with 1 method)

If I was using baremodule, I would have done something like this:

julia> baremodule Animal

       """
       `add(x, y)`

       This function sums up `x` and `y`
       """
       add(x, y) = x + y

       end
@doc "foo" Animal.add
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