@clumsybear Here is an article that describes my workflow in great detail using Sketch to AE ( I figured this out by myself and then stumbled on this doh ). For a static UI element, a one frame composition works fine from my initial tests.
https://uxplanet.org/tricks-and-tips-to-work-with-lottie-7781ed4bec74
Once you have the .JSON export file from Bodymovin, copy and paste the code into the rLottie demo app that is available in the latest scriptnode build and compress it into a HISE snippet.Once you have this use the looping rLottie animation code provided in the documentation and then paste the compressed snippet in the magic line, compile and voila - you have your design just how you did it in Sketch!
There are a few limitations on using fancy multiple gradients and effects etc. that you have to watch for, but other than that, you can save countless hours of manual rebuilding with this method if you have sophisticated designs.