Working on a site right now using Kontainer (
https://kontainer.com/). They have an Umbraco integration where it sends you to their web platform to manage crops, focal points, etc. Then generates a cdn link with all your choices and sends back to umbraco once you are done to be stored.
Works pretty well as a property editor integration, however still has issues where fx they change meta data in the DAM then it's not uodated as Umbraco just has a snapshort from when you saved