A good place to start is this blog post, but the short answer is … no. Now, when you read that post, you’ll see at the bottom a link to a proof of concept app to convert spd workflows to flow. Not bad. And, for very simple workflows that might even be great. But the reality is that for intermediate level flows or up, you’ll often need to go back to the requirements and then design the forms and workflows based on that.
Sorry that sounds like a lot, but going back to the requirements IS my shortcut, as trying to copy a workflow action by action is often a frustrating experience.