Creating GTK::Closure::Expression objects from Builder Descriptions

If I have the following builder markup:

<object class="AdwComboRow">
  <property name="expression">
     <closure type="gchararray" function="fold_policy_name"/>

What would this look like if I were to create it by hand? I have a use-case, but the use of builder is out of scope, so I am having to produce several of these without it. Can someone help?

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