Hey, thanks for sharing this with the rest of us! I think this is some very useful information. I'm happy there is a better way to use the maps made in TileMaker DOT inside Unreal Engine!
Also I can say this, in case you are actively using and making maps using TileMaker DOT, I have some very big updates planned in the next few months before Christmas this year. You will get Properties and class type exports directly into .TMX ,TSX, Json and the other exports. You will also get Collisions options, and HUE Color changing too, and a very big redesign of the tool for the welcome page, and a "recent projects" tab, so you will not have to keep opening the app and load the map there. And other big changes all around the tool.
There are lots of stuff coming soon, so thanks again for the interest and sharing this stuff with me and the rest of us that are interested here!