Honest answer, I’ve never heard of any. Whilst I don’t doubt some people do try to use PP like that, I’ve never encountered more than a screenshot embedded in a slide deck to show off what is being proposed. My immediate thought is PowerPoint just doesn’t off the fine grained level of control needed to manipulate screen assets at pixel level, which is likely what you’d need. All I feel you could get to would be an approximation of what a design might look like.