Hi r3verser! Thank you for the kudos 
Actually, I don’t think Defold currently supports isometric tilemaps. At least it didn’t when I began this project. That’s why I made my own system - it works but it’s pretty resource intensive.
I design the maps in Tiled, and apply custom properties on each layer that helps me know what to do with each tile layer once I get it into Defold.
Tiled actually exports directly into .lua files, which is great for working with Defold. Here’s what it looks like when exported:
Once I have this in, I iterate over the table and spawn game objects with a sprite in them. Which sprite I spawn is determined by the “tileset” property I set above.
That’s the gist of it!