Hi there @bluemad! Apologies for the delay in getting back to you; I wanted to discuss this further with our team.
While this isn’t part of our initial implementation of converting JPEG to WebP, it is something we’d consider for a future addition. The main challenge with the implementation here is that PNGs are lossless but WebP is lossy, which makes things tricky. We’ve found that the savings in terms of compression from PNG to WebP are great, but there can be unexpected issues due to the lossless to lossy transition.
For now, I’ve added an issue for this request in our GitHub repo. Feel free to subscribe and follow along for future updates.
I’ll mark this topic as resolved, but if you have any other questions, just let me know!