No public policy evaluation realized fully by a machine is in perspective. We need men (probably civil servants, or members of agencies specialized in the evaluation of public policies.
What exists so far, for example in France, is a platform where all the previous evaluations of public policies are gathered (L’observatoire de l’évaluation des politiquespubliques). There are however reasons to think, as you suggest, that a use of AI can be made to make these evaluation easier, faster, but the initiative comes from the central State (general inspections), the state or territories (cour des comptes), and I don’t feel such advanced methods are on the roadmap so far. This is an interesting question. For the experts though, is it the best to ask ?