A built in animation editor would be terrific, though I’m estimating something like that would likely take a ton of work and would likely be an extension. I also reckon the devs are more focused on other things since the team is not super large.
Community-wise though, there is a terrific browser tool built by @Insality that is animation editor with a GUI where you can export the resulting code right into Defold.
Here is the forum link:
https://forum.defold.com/t/panthera-animation-software-for-defold/71276
Extra Quotes from that Forum Page:
Blockquote
Panthera main purpose - give your the huge speed up at Defold animation flow even with more accuracy. You not required to do animations via code and run the game every change to see the changes. Make animations in the Panthera and export it via code right into the game!
I’ll also add there is this extension for making paths and having GOs follow those paths:
https://github.com/dev-masih/defgraph